T-C AT&T Inc

As filed with the Securities and Exchange Commission on February 28, 2025

Registration No. 333-   

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form S-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

AT&T Inc.

(Exact Name of Registrant as Specified in Its Charter)

One AT&T Plaza

208 S. Akard St.

Dallas, Texas 75202

(210) 821-4105

(Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant’s Principal Executive Offices)

Stacey S. Maris

Senior Vice President, Secretary and Chief Privacy Officer

AT&T Inc.

One AT&T Plaza

208 S. Akard St.

Dallas, Texas 75202

(210) 821-4105

(Name, Address, Including Zip Code, and Telephone Number, Including Area Code, of Agent for Service)

Copies to:

Approximate date of commencement of proposed sale to the public: As soon as practicable after the effective date of the Registration Statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ☒

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

AT&T Inc.

Senior Debt Securities

Subordinated Debt Securities

Preferred Stock

Depositary Shares

Common Stock

AT&T Inc. (“AT&T”) from time to time may offer to sell senior debt securities, subordinated debt securities, preferred stock, either separately or represented by depositary shares, and common stock. The senior debt securities, subordinated debt securities and preferred stock may be convertible into or exercisable or exchangeable for common or preferred stock of the Company or debt or equity securities of one or more other entities. The common stock of the Company is listed on the New York Stock Exchange and trades under the ticker symbol “T”.

The Company may offer and sell these securities to or through one or more underwriters, dealers and agents, or directly to purchasers, on a continuous or delayed basis. See “Plan of Distribution” for a further description of the manner in which we may dispose of the securities covered by this prospectus.

This prospectus describes some of the general terms that may apply to these securities and the general manner in which they may be offered. The specific terms of any securities to be offered, and the specific manner in which they may be offered, will be described in a supplement to this prospectus. A prospectus supplement may also add, update or change information contained in this prospectus. This prospectus may not be used to offer or sell securities unless accompanied by a prospectus supplement describing the method and terms of the applicable offering.

You should carefully read this prospectus and the applicable prospectus supplement, together with the documents incorporated by reference herein and therein, before making an investment decision.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Prospectus dated February 28, 2025.

TABLE OF CONTENTS

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Description of AT&T Inc.

AT&T Inc. (“AT&T,” “we” or the “Company”) is a leading provider of telecommunications and technology services globally. The services and products that we offer vary by market and utilize various technology platforms in a range of geographies. We were incorporated under the laws of the State of Delaware in 1983 and have our principal executive offices at 208 S. Akard St., Dallas, Texas, 75202 (telephone number (210) 821-4105). We maintain an internet website at www.att.com. This website address is for information only and is not intended to be an active link or to incorporate any website information into this document.

We manage our business through two reportable segments: Communications and Latin America. The Communications segment provides wireless and wireline telecom and broadband services to consumers located in the U.S. and businesses globally. The Communications segment contains the following business units: mobility, business wireline and consumer wireline. The Latin America segment provides wireless services and equipment in Mexico.

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Use of Proceeds

Unless otherwise specified in the prospectus supplement, we will use the proceeds from the sale of the securities to provide funds for general corporate purposes, among other things.

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Summary Description of the Securities We May Issue

We may use this prospectus to offer from time to time:

In the case of securities that are exchangeable for securities of a third-party issuer, the applicable prospectus supplement will give you more information about this issuer, the terms of its securities and the document in which they are described. Our securities include securities denominated in U.S. dollars, but we can choose to issue securities in any other currency, including the Euro.

The applicable prospectus supplement will describe the specific types, amounts, prices and detailed terms of any of these securities. The applicable prospectus supplement may also contain information, where applicable, about material U.S. federal income tax considerations relating to, and any securities exchange listing of, securities covered by such prospectus supplement.

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Description of Debt Securities We May Offer

As required by U.S. federal law for all bonds and notes of companies that are publicly offered, our senior debt securities and subordinated debt securities, which we collectively refer to as the “debt securities,” will be governed by two separate documents, each called an indenture. Each indenture is a contract between us and The Bank of New York Mellon Trust Company, N.A., a national banking association, which acts as trustee for you. The trustee has two main roles:

We may issue as many distinct series of securities under the applicable indenture as we wish. This section summarizes terms of the securities that are common to all series. Except for the subordination provisions included in the subordinated indenture, the indentures are substantially similar. Most of the financial terms and other specific terms of your series will be described in the applicable prospectus supplement which will be attached to the front of this prospectus. Those terms may vary from the terms described here. The prospectus supplement may also describe special federal income tax consequences of the debt securities.

This Section Is Only a Summary

This section and your prospectus supplement summarize all the material terms of the indentures and your debt securities. They do not, however, describe every aspect of the indentures and your debt securities.

The indentures and their associated documents, including your debt securities, contain the full text of the matters described in this section and your prospectus supplement. The indentures and the debt securities are governed by New York law. Copies of the indentures have been filed with the Securities and Exchange Commission, or SEC, as part of our registration statement. See “Where You Can Find More Information” below for information on how to obtain a copy. Section references in the description that follows relate to the indentures.

Legal Ownership of Debt Securities

We can issue debt securities in registered form or in the form of one or more global securities. We refer to those who have debt securities registered in their own names on the books that we or our agent maintain for this purpose as the “holders” of those debt securities. These persons are the legal holders of the debt securities. We refer to those who, indirectly through others, own beneficial interests in debt securities that are not registered in their own names as “indirect holders” of those debt securities. As we discuss below, indirect holders are not legal holders, and investors in debt securities issued in book-entry form or in street name will be indirect holders.

Book-Entry Holders

We may issue debt securities in book-entry form only, as we will specify in the applicable prospectus supplement. This means debt securities may be represented by one or more global securities registered in the name of a financial institution that holds them as depositary on behalf of other financial institutions that participate in the depositary’s book-entry system. These participating institutions, in turn, hold beneficial interests in the debt securities on behalf of themselves or their customers.

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For registered debt securities, only the person in whose name a debt security is registered is recognized under the applicable indenture as the holder of that debt security. Debt securities issued in global form will be issued in the form of a global security registered in the name of the depositary or its participants. Consequently, for debt securities issued in global form, we will recognize only the depositary as the holder of the debt securities and we will make all payments on the debt securities to the depositary. The depositary passes along the payments it receives to its participants, which in turn pass the payments along to their customers who are the beneficial owners. The depositary and its participants do so under agreements they have made with one another or with their customers; they are not obligated to do so under the terms of the debt securities.

As a result, investors in a book-entry security will not own debt securities directly. Instead, they will own beneficial interests in a global security, through a bank, broker or other financial institution that participates in the depositary’s book-entry system or holds an interest through a participant. As long as the debt securities are issued in global form, investors will be indirect holders, and not holders, of the debt securities.

Street Name Holders

In the future we may terminate a global security or issue debt securities initially in non-global form. In these cases, investors may choose to hold their debt securities in their own names or in “street name”. Debt securities held by an investor in street name would be registered in the name of a bank, broker or other financial institution that the investor chooses, and the investor would hold only a beneficial interest in those debt securities through an account he or she maintains at that institution.

For debt securities held in street name, we will recognize only the intermediary banks, brokers and other financial institutions in whose names the debt securities are registered as the holders of those debt securities and we will make all payments on those debt securities to them. These institutions pass along the payments they receive to their customers who are the beneficial owners, but only because they agree to do so in their customer agreements or because they are legally required to do so; they are not obligated to do so under the terms of the debt securities. Investors who hold debt securities in street name will be indirect holders, not holders, of those debt securities.

Legal Holders

Our obligations, as well as the obligations of the trustee and those of any third parties employed by us or the trustee, run only to the legal holders of the debt securities. We do not have obligations to investors who hold beneficial interests in global securities, in street name or by any other indirect means. This will be the case whether an investor chooses to be an indirect holder of a debt security or has no choice because we are issuing the debt securities only in global form.

For example, once we make a payment or give a notice to the holder, we have no further responsibility for the payment or notice even if that holder is required, under agreements with depositary participants or customers or by law, to pass it along to the indirect holders but does not do so. Similarly, if we want to obtain the approval of the holders for any purpose — e.g., to amend the applicable indenture or to relieve us of the consequences of a default or of our obligation to comply with a particular provision of the applicable indenture — we would seek approval only from the holders, and not the indirect holders, of the debt securities. Whether and how the holders contact the indirect holders is up to the holders.

When we refer to you, we mean those who invest in the debt securities being offered by this prospectus, whether they are the holders or only indirect holders of those debt securities. When we refer to your debt securities, we mean the debt securities in which you hold a direct or indirect interest.

Special Considerations for Indirect Holders

If you hold debt securities through a bank, broker or other financial institution, either in book-entry form or in street name, you should check with your own institution to find out:

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What Is a Global Security?

A global security is a security that represents one or more debt securities and is held by a depositary. Generally, all debt securities represented by the same global securities will have the same terms.

Each debt security issued in book-entry form will be represented by a global security that we deposit with and register in the name of a financial institution that we select or its nominees. The financial institution that we select for this purpose is called the depositary. Unless we specify otherwise in the applicable prospectus supplement, The Depository Trust Company, New York, New York, known as DTC, will be the depositary for all debt securities issued in book-entry form.

A global security may not be transferred to or registered in the name of anyone other than the depositary, its nominee or a successor depositary, unless special termination situations arise. We describe those situations below under “— Special Situations When a Global Security Will Be Terminated”. As a result of these arrangements, the depositary, or its nominee, will be the sole registered owner and holder of all debt securities represented by a global security, and investors will be permitted to own only beneficial interests in a global security. Beneficial interests must be held by means of an account with a broker, bank or other financial institution that in turn has an account with the depositary or with another institution that does. Thus, an investor whose security is represented by a global security will not be a holder of the debt security, but only an indirect holder of a beneficial interest in the global security.

If the prospectus supplement for a particular debt security indicates that the debt security will be issued in global form only, then the debt security will be represented by a global security at all times unless and until the global security is terminated. We describe the situations in which this can occur below under “— Special Situations When a Global Security Will Be Terminated”. If termination occurs, we may issue the debt securities through another book-entry clearing system or decide that the debt securities may no longer be held through any book-entry clearing system.

Special Considerations for Global Securities

As an indirect holder, an investor’s rights relating to a global security will be governed by the account rules of the investor’s financial institution and of the depositary, as well as general laws relating to securities transfers. We do not recognize this type of investor as a holder of debt securities and instead deal only with the depositary that holds the global security.

If debt securities are issued only in the form of a global security, an investor should be aware of the following:

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Special Situations When a Global Security Will Be Terminated

In a few special situations described below, the global security will terminate and interests in it will be exchanged for physical certificates representing those interests. After that exchange, the choice of whether to hold securities directly or in street name will be up to the investor. Investors must consult their own bank or brokers to find out how to have their interests in securities transferred to their own name, so that they will be direct holders. We have described the rights of holders and street name investors above under “— Legal Ownership of Debt Securities”.

The global security will terminate when the following special situations occur:

The prospectus supplement may also list additional situations for terminating a global security that would apply only to the particular series of securities covered by the prospectus supplement. When a global security terminates, the depositary — and not we or the trustee — is responsible for deciding the names of the institutions that will be the initial direct holders. (Sections 2.08(f) and (g))

In the remainder of this section, “you” means direct holders and not “street name” or other indirect holders of securities, including holders of any securities that we issue as global securities. Indirect holders should read the previous subsection entitled “Legal Ownership of Debt Securities”.

Overview of Remainder of This Section

The remainder of this section summarizes:

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Additional Mechanics

Form, Exchange and Transfer

The securities will be issued:

You may have your securities broken into more securities of smaller denominations (but not into denominations smaller than any minimum denomination applicable to the securities) or combined into fewer securities of larger denominations, as long as the total principal amount is not changed. This is called an “exchange.” (Section 2.08(a))

You may exchange or transfer your securities at the office of the registrar. The registrar acts as our agent for registering securities in the names of holders and for transferring and exchanging securities, as well as maintaining the list of registered holders. The paying agent acts as the agent for paying interest, principal and any other amounts on securities and for exchanging securities. We have appointed The Bank of New York Mellon Trust Company, N.A. to perform the roles of registrar and paying agent. We may change these appointments to another entity or perform them ourselves. (Section 2.08(b))

We can designate additional registrars or paying agents, acceptable to the trustee, and they would be named in the prospectus supplement. We may cancel the designation of any particular registrar or paying agent. We may also approve a change in the office through which any registrar or paying agent acts. We must maintain a registrar and paying agent office in the Borough of Manhattan in New York City. If at any time we do not maintain a registrar or paying agent, the trustee will act as such. (Section 2.04)

There is no charge for exchanges and transfers. You will not be required to pay a service charge to transfer or exchange securities, but you may be required to pay for any tax or other governmental charge associated with the exchange or transfer. The transfer or exchange will only be made if the registrar is satisfied with your proof of ownership. (Section 2.08)

At certain times, you may not be able to transfer or exchange your securities. If we redeem any series of securities, or any part of any series, then we may prevent you from transferring or exchanging these securities. We may do this during the period beginning 15 days before the day we mail the notice of redemption and ending on the day of that mailing, in order to freeze the list of holders so we can prepare the mailing. We may also refuse to register transfers or exchanges of securities selected for redemption, except that we will continue to permit transfers and exchanges of the unredeemed portion of any security being partially redeemed. (Section 2.08(d))

Replacing Your Lost or Destroyed Certificates

If you bring a mutilated certificate or coupon to the trustee, we will issue a new certificate or coupon to you in exchange for the mutilated one. Please note that the trustee may have additional requirements that you must meet in order to do this. (Section 2.09)

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If you claim that a certificate or coupon has been lost, completely destroyed, or wrongfully taken from you, then the trustee will give you a replacement certificate or coupon if you meet the trustee’s requirements. Also, we may require you to provide reasonable security or indemnity to protect us from any loss we may incur from replacing your certificates or coupons. We may also charge you for our expenses in replacing your security. (Section 2.09)

Payment and Paying Agents

We will pay interest to you if you are a direct holder listed in the registrar’s records at the close of business on a particular day in advance of each due date for interest, even if you no longer own the security on the interest due date. That particular day, usually about two weeks in advance of the interest due date, is called the “record date” and is stated in the prospectus supplement. (Section 2.05) Holders buying and selling securities must work out between them how to compensate for the fact that we will pay all the interest for an interest period to the one who is the registered holder on the record date. The most common manner is to adjust the sales price of the securities to prorate interest fairly between buyer and seller. This prorated interest amount is called “accrued interest.”

We will pay interest, principal and any other money due on the securities at the corporate trust office of the trustee in New York City. That office is currently located at The Bank of New York Mellon Trust Company, N.A., c/o The Bank of New York Mellon, 240 Greenwich Street, New York, New York 10007, Attention: Corporate Trust Administration. You must make arrangements to have your payments picked up at or wired from that office. We may also choose to pay interest by mailing checks. (Section 2.05)

“Street name” and other indirect holders should consult their banks or brokers for information on how they will receive payments.

We may also arrange for additional payment offices, and may cancel or change these offices, including our use of the trustee’s corporate trust office. These offices are called “paying agents”. We may also choose to act as our own paying agent. We must notify you if we change the paying agents for any particular series of securities. (Section 2.04)

Notices

We and the trustee will send notices regarding the securities only to direct holders, using their addresses as listed in the trustee’s records. Notwithstanding the foregoing, where a notice of any event or any other communication is to be given to a holder of a global security, such notice shall be sufficiently given if given to the depository (or its designee) pursuant to the standing instructions from the depository or its designee, including by electronic mail in accordance with accepted practices at the depository. (Section 10.02)

Regardless of who acts as paying agent, all money we forward to a paying agent that remains unclaimed will, at our request, be repaid to us at the end of two years after the amount was due to the direct holder. After that two-year period, you may look only to us for payment and not to the trustee, any other paying agent or anyone else. (Section 8.03)

Special Situations Covered by Our Indentures

Mergers and Similar Transactions

We are generally permitted to consolidate or merge with another company. We are also permitted to sell substantially all of our assets to another company. However, we may not take any of these actions unless all the following conditions are met:

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Further, we may buy substantially all of the assets of another company without complying with any of the foregoing conditions.

Modification and Waiver of Your Contractual Rights

Under certain circumstances, we can make changes to the indentures and the securities. Some types of changes require the approval of each security holder affected, some require approval by a majority vote, and some changes do not require any approval at all. (Sections 9.01-9.06)

Changes Requiring Your Approval. First, there are changes that cannot be made to your securities without your specific approval. The following is a list of those types of changes:

Changes Requiring a Majority Vote. The second type of change to the indentures and the securities is the kind that requires a vote in favor by security holders owning a majority of the principal amount of the particular series affected. Most changes fall into this category, except as set forth in the following paragraph. The same vote would be required for us to obtain a waiver of an existing default. However, we cannot obtain a waiver of a payment default unless we obtain your individual consent to the waiver. (Section 9.02(a))

Changes Not Requiring Your Approval. The third type of change does not require any vote by holders of securities. This type includes, among others, clarifications of ambiguous contract terms, changes to make securities payable in U.S. dollars (if the stated denomination ceases to exist) and other changes that would not materially adversely affect holders of the securities. (Section 9.01)

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Further Details Concerning Voting. When taking a vote, we will use the following rules to decide how much principal amount to attribute to a security:

Securities will not be considered outstanding, and therefore not eligible to vote, if we have deposited or set aside in trust for you money for their payment or redemption. A security does not cease to be outstanding because we or an affiliate of us is holding the security. (Section 2.10)

We will generally be entitled to set any day as a record date for the purpose of determining the holders of outstanding securities that are entitled to vote or take other action under the indentures. However, the indentures do not oblige us to fix any record date at all. If we set a record date for a vote or other action to be taken by holders of a particular series, that vote or action may be taken only by persons who are holders of outstanding securities of that series on the record date and must be taken within 90 days following the record date. (Section 9.02(b))

Holders who hold in “street name” and other indirect holders, including holders of any securities issued as global securities, should consult their banks or brokers for information on how approval may be granted or denied if we seek to change the indentures or the securities or request a waiver.

Discharge of Our Obligations

We can fully discharge ourselves from any payment or other obligations on the securities of any series if we make a deposit for you with the trustee and certain other conditions are met. The deposit must be held in trust for your benefit and the benefit of all other direct holders of the securities and must be a combination of money and U.S. government or U.S. government agency notes or bonds that will generate enough cash to make interest, principal and any other payments on the securities on their various due dates.

However, we cannot discharge ourselves from the obligations under any convertible or exchangeable securities, unless we provide for it in the terms of these securities and the prospectus supplement.

If we accomplish full discharge, as described above, you will have to rely solely on the trust deposit for repayment of the securities. You could not look to us for repayment in the unlikely event of any shortfall. Conversely, the trust deposit would most likely be protected from claims of our lenders and other creditors if we ever become bankrupt or insolvent.

We will indemnify the trustee and you against any tax, fee or other charge imposed on the U.S. government obligations we deposited with the trustee or against the principal and interest received on these obligations. (Sections 8.01-8.04)

Redemption

We May Choose to Redeem Your Securities

We may be able to pay off your securities before their normal maturity. If we have this right with respect to your specific securities, the right will be mentioned in the prospectus supplement. It will also specify when we can exercise this right and how much we will have to pay in order to redeem your securities.

If we choose to redeem your securities, we will mail written notice to you not less than 30 days prior to redemption, and not more than 60 days prior to redemption, or not less than or more than such number of days as

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described in the prospectus supplement. Also, you may be prevented from exchanging or transferring your securities when they are subject to redemption, as described under “— Additional Mechanics — Form, Exchange and Transfer” above. (Article 3)

Liens on Assets

The indentures do not restrict us from pledging or otherwise encumbering any of our assets and those of our subsidiaries.

Default and Related Matters

Ranking Compared to Other Creditors

The securities are not secured by any of our property or assets. Accordingly, your ownership of securities means you are one of our unsecured creditors. The senior debt securities are not subordinated to any of our other debt obligations and therefore they rank equally with all our other unsecured and unsubordinated indebtedness. The subordinated debt securities are subordinated to the senior indebtedness and will rank junior in right of payment, under the terms contained in the subordinated indenture, and will be subject to our prior payment in full of our senior indebtedness, all as described under “— Subordination” below. Notwithstanding any of the foregoing, the trustee under each indenture has a right to receive payment for its administrative services prior to any payment to security holders after a default.

Events of Default

You will have special rights if an event of default occurs and is not cured, as described later in this subsection.

What Is an Event of Default? The term “event of default” with respect to any series of securities means any of the following:

Remedies if an Event of Default Occurs

You and the trustee will have the following remedies if an event of default occurs:

Acceleration. If an event of default has occurred and has not been cured or waived, then the trustee or the holders of 25% in principal amount of the securities of the affected series may declare the entire principal amount of and any accrued interest on all the securities of that series to be due and immediately payable. An acceleration of maturity may be cancelled by the holders of at least a majority in principal amount of the securities of the affected series, if all events of default have been cured or waived. (Section 6.02)

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Special Duties of Trustee. If an event of default occurs, the trustee will have some special duties. In that situation, the trustee will be obligated to use those of its rights and powers under the applicable indenture, and to use the same degree of care and skill in doing so, that a prudent person would use in that situation in conducting his or her own affairs. (Section 7.01)

Other Remedies of Trustee. If an event of default occurs, the trustee is authorized to pursue any available remedy to collect defaulted principal and interest and to enforce other provisions of the securities and the applicable indenture, including bringing a lawsuit. (Section 6.03)

Majority Holders May Direct the Trustee to Take Actions to Protect Their Interests. The trustee is not required to take any action under the applicable indenture at the request of any holders unless the holders offer the trustee reasonable protection from expenses and liability. This is called an “indemnity”. If the trustee is provided with an indemnity reasonably satisfactory to it, the holders of a majority in principal amount of the relevant series of debt securities may direct the time, method and place of conducting any lawsuit or other formal legal action seeking any remedy available to the trustee. These majority holders may also direct the trustee in performing any other action under the applicable indenture. (Section 6.05)

Individual Actions You May Take if the Trustee Fails to Act. Before you bypass the trustee and bring your own lawsuit or other formal legal action or take other steps to enforce your rights or protect your interests relating to the securities, the following must occur:

However, you are entitled at any time to bring an individual lawsuit for the payment of the money due on your security on or after its due date. (Section 6.07)

Waiver of Default

The holders of a majority in principal amount of the relevant series of debt securities may waive a default for all the relevant series of debt securities. If this happens, the default will be treated as if it had not occurred. No one can waive a payment default on your debt security, however, without your individual approval. (Section 6.04)

We Will Give the Trustee Information About Defaults Annually

Every year we will give to the trustee a written statement of one of our officers certifying that to the best of his or her knowledge we are in compliance with the indentures and all the securities under it, or else specifying any default. (Section 4.03)

The trustee may withhold from you notice of any uncured default, except for payment defaults, if it determines that withholding notice is in your interest. (Section 7.05)

Holders who hold in “street name” and other indirect holders should consult their banks or brokers for information on how to give notice or direction to or make a request of the trustee and how to make or cancel a declaration of acceleration.

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Original Issue Discount Securities

The debt securities may be issued as original issue discount securities, which will be offered and sold at a substantial discount from their principal amount. Only a discounted amount will be due and payable when the trustee declares the acceleration of the maturity of these debt securities after an event of default has occurred and continues, as described under “— Default and Related Matters — Remedies if an Event of Default Occurs” above.

Conversion of Convertible Debt Securities

Your debt securities may be convertible into our preferred stock, including depositary shares representing preferred stock, or common stock, or they may be exchangeable for equity securities of another issuer if the prospectus supplement so provides. If your debt securities are convertible or exchangeable, the prospectus supplement will include provisions as to whether conversion or exchange is mandatory, at your option or at our option. The prospectus supplement would also include provisions regarding the adjustment of the number of shares of common stock or other securities you will receive upon conversion or exchange. In addition, the prospectus supplement will contain the conversion price or exchange price and mechanisms for adjusting this price. In the case of exchangeable debt securities, the prospectus supplement will set forth information about the issuer for whose securities you would exchange your debt, or where that information can be found.

We may not adjust the exchange or conversion price

Unless it is specified in the prospectus supplement, we will not adjust the exchange or conversion price of your debt securities for interest on your securities or for any dividends payable on the new securities you will receive. However, if you convert or exchange your securities between a regular record date for the payment of interest and the next following interest payment date, you must include funds equal to the interest that would be payable on your securities on this following interest payment date. We are not required to issue fractional shares of preferred stock, depositary shares or common stock, but, unless we otherwise specify in the prospectus supplement, we will pay you a cash adjustment calculated on the basis of the following:

Regarding the Trustee

We maintain banking relationships in the ordinary course of business with the trustee. The trustee is also the trustee under indentures with certain of our subsidiaries.

Subordination

Unless otherwise indicated in the applicable prospectus supplement for a particular series of subordinated debt securities, the following subordinated provisions will apply to the subordinated debt securities.

The subordinated debt securities will be unsecured and subordinated in right of payment to all of our existing and future senior indebtedness. As a result, upon any distribution to our creditors in a liquidation, dissolution, bankruptcy, insolvency or reorganization, the payment of the principal of and interest on the subordinated debt securities will be subordinated to the extent provided in the subordinated indenture in right of payment to the prior payment in full of all our senior indebtedness. Our obligation to make payments of the principal of and interest on the subordinated debt securities will not otherwise be affected.

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We may not make payments of principal or interest on the subordinated debt securities at any time we are in default on any payment with respect to our senior indebtedness, or we have defaulted on any of our senior indebtedness resulting in the acceleration of the maturity of the senior indebtedness beyond any applicable grace period, or if there is a judicial proceeding pending with respect to our default on our senior indebtedness and we have received notice of the default. We may resume payments on the subordinated debt securities when the default is cured or waived if the subordination provisions of the subordinated indenture will permit us to do so at that time. After we have paid all of our senior indebtedness in full, holders of subordinated debt securities will still be subrogated to the rights of holders of our senior indebtedness for the amount of distributions otherwise payable to holders of the subordinated debt securities until the subordinated debt securities are paid in full.

Even if the subordination provisions prevent us from making any payment when due on the subordinated debt securities of any series, we will be in default on our obligations under that series if we do not make the payment when due. This means that the trustee under the subordinated indenture and the holders of that series can take action against us, but they will not receive any money until the claims of the holders of senior indebtedness have been fully satisfied.

If payment or distribution on account of the subordinated debt securities of any character or security, whether in cash, securities or other property, is received by a holder of any subordinated debt securities, including any applicable trustee, in contravention of any of the terms of the applicable indenture and before all our senior indebtedness has been paid in full, that payment or distribution or security will be received in trust for the benefit of, and must be paid over or delivered and transferred to, holders of our senior indebtedness at the time outstanding in accordance with the priorities then existing among those holders for application to the payment of all senior indebtedness remaining unpaid to the extent necessary to pay all senior indebtedness in full.

Upon payment or distribution of assets to creditors upon insolvency, receivership, conservatorship, reorganization, readjustment of debt, marshalling of assets and liabilities or similar proceedings or any liquidation or winding up of or relating to our company as a whole, whether voluntary or involuntary, the holders of all senior debt securities will first be entitled to receive payment in full before holders of the outstanding subordinated debt securities will be entitled to receive any payment in respect of the principal of, or premium, if any, or interest on, the outstanding subordinated debt securities.

After we have paid in full all sums we owe on our senior indebtedness, the holders of the subordinated debt securities, if so issued, together with the holders of our obligations ranking on a parity with the subordinated debt securities, will be entitled to be paid from our remaining assets the amounts at the time due and owing on the subordinated debt securities and the other obligations.

By reason of this subordination, if we become insolvent, holders of senior indebtedness, as well as certain of our general creditors, may receive more, and holders of subordinated debt securities may receive less, than our other creditors, including holders of any of our senior debt securities. This subordination will not prevent the occurrence of any event of default under the subordinated debt securities. (subordinated indenture, Article 11)

Senior indebtedness is defined in the subordinated indenture as the principal, premium, if any, unpaid interest (including interest accruing on or after the filing of any petition in bankruptcy or for reorganization relating to us whether or not a claim for post-filing interest is allowed in such proceeding), fees, charges, expenses, reimbursement and indemnification obligations, and all other amounts payable under or in respect of the types of indebtedness generally described below:

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provided, however, that, in computing our indebtedness, any particular indebtedness will be excluded if:

Senior indebtedness will exclude the following:

There is no limit on the amount of senior indebtedness or other indebtedness that we may incur under the indentures.

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Description of Preferred Stock We May Offer

The following briefly summarizes the material terms of our preferred stock other than pricing and related terms which will be disclosed in the applicable prospectus supplement. You should read the particular terms of any series of preferred stock we offer, which will be described in more detail in the applicable prospectus supplement relating to that series. The applicable prospectus supplement will also state whether any of the terms summarized below do not apply to the series of preferred stock being offered. In addition, for each series of preferred stock, we will file a certificate of designations containing the specific terms of the series as an exhibit to the registration statement or we will incorporate it by reference before we issue any preferred stock.

General

We are authorized to issue up to 10,000,000 shares of preferred stock, par value $1.00 per share. As of the date of this prospectus, there were 48,000 shares of Series A preferred stock outstanding, 20,000 shares of Series B preferred stock outstanding and 70,000 shares of Series C preferred stock outstanding. Under our restated certificate of incorporation, our board of directors is authorized to issue additional shares of preferred stock in one or more series. To establish a series of preferred stock, our board must set the following terms:

Before we issue any series of preferred stock, our board of directors will adopt resolutions creating and designating the series as a series of preferred stock. Stockholders will not need to approve these resolutions.

Terms Contained in Prospectus Supplement

A prospectus supplement will contain the dividend, liquidation, redemption and voting rights of a series of preferred stock. The prospectus supplement will describe the following terms of a series of preferred stock:

No Preemptive Rights

The holders of preferred stock will have no preemptive rights to buy any additional shares. The preferred stock will be, when issued, fully paid and nonassessable. Neither the par value nor the liquidation preference can show you the price at which the preferred stock will actually trade on or after the date of issuance. The applicable prospectus supplement will describe some of the U.S. federal income tax consequences of the purchase and ownership of the series of preferred stock.

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Description of Depositary Shares We May Offer

We may offer depositary shares evidenced by depositary receipts. Each depositary receipt represents a fraction of a share of the particular series of preferred stock issued and deposited with a depositary. The fraction of a share of preferred stock which each depositary share represents will be set forth in the applicable prospectus supplement relating to those depositary shares. As of the date of this prospectus, there were 48,000,000 depositary shares outstanding, each representing a 1/1,000th interest in a share of Series A preferred stock, and 70,000,000 depositary shares outstanding, each representing a 1/1,000th interest in a share of Series C preferred stock.

We will describe the transfer agent for each series of preferred stock in the applicable prospectus supplement.

Description of Depositary Shares

The following briefly summarizes the material provisions of the deposit agreement and of the depositary shares and depositary receipts, other than pricing and related terms disclosed in the accompanying prospectus supplement. You should read the particular terms of any depositary shares and any depositary receipts that we offer. You should also read the deposit agreement relating to the particular series of preferred stock and the more detailed description of the deposit agreement in the prospectus supplement. The prospectus supplement will also state whether any of the generalized provisions summarized below do not apply to the depositary shares or depositary receipts being offered.

General

We will deposit the shares of any series of preferred stock represented by depositary shares according to the provisions of a deposit agreement between us and a bank or trust company which we will select as our preferred stock depositary. The depositary must have its principal office in the United States and have a combined capital and surplus of at least $50,000,000. Each owner of a depositary share will be entitled to all the rights and preferences of the underlying preferred stock in proportion to the applicable fraction of a share of preferred stock represented by the depositary share. These rights include dividend, voting, redemption, conversion and liquidation rights. The depositary will send you all reports and communications which we will deliver to the depositary and which we have to furnish to you.

The following is a summary of the deposit agreement. For more complete information, you should read the entire agreement and the depositary receipt. Directions on how to obtain copies of these are provided under “Where You Can Find More Information” below.

Depositary Receipts

The depositary shares will be evidenced by depositary receipts issued pursuant to the deposit agreement. Depositary receipts will be distributed to anyone who is buying the fractional shares of preferred stock in accordance with the terms of the applicable prospectus supplement. We will either file the forms of deposit agreement and depositary receipt as exhibits to the registration statement of which this prospectus is a part, or we will incorporate them by reference into that registration statement.

While definitive engraved depositary receipts (certificates) are being prepared, we may instruct the depositary to issue temporary depositary receipts, which will entitle you to all the rights of the definitive depositary receipts and be substantially in the same form. The depositary will prepare definitive depositary receipts without unreasonable delay, and we will pay for the exchange of your temporary depositary receipts for definitive depositary receipts.

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Withdrawal of Preferred Stock

You may receive the number of whole shares of your series of preferred stock and any money or other property represented by those depositary receipts after surrendering the depositary receipts at the corporate trust office of the depositary. Partial shares of preferred stock will not be issued. If the depositary shares which you surrender exceed the number of depositary shares that represent the number of whole shares of preferred stock you wish to withdraw, then the depositary will deliver to you at the same time a new depositary receipt evidencing the excess number of depositary shares. Once you have withdrawn your preferred stock, you will not be entitled to re-deposit that preferred stock under the deposit agreement in order to receive depositary shares. We do not expect that there will be any public trading market for withdrawn shares of preferred stock.

Dividends and Other Distributions

The depositary has agreed to pay to you the cash dividends or other cash distributions it receives on preferred stock, after deducting its fees and expenses. You will receive these distributions in proportion to the number of depositary shares you own. The depositary will distribute only whole U.S. dollars and cents. The depositary will add any fractional cents not distributed to the next sum received for distribution to record holders of depositary shares.

In the event of a non-cash distribution, the depositary will distribute property to the record holders of depositary shares entitled to it, unless the depositary determines that it is not feasible to make such a distribution, in which case the depositary may, with our approval, sell the property and distribute the net proceeds from the sale to the holders.

Redemption of Depositary Shares

If we redeem a series of preferred stock represented by depositary shares, then we will give the necessary proceeds to the depositary. The depositary will then redeem the depositary shares using the funds it received from us for the preferred shares. The depositary will notify the record holders of the depositary shares to be redeemed not less than 30 nor more than 60 days before the date fixed for redemption at the holders’ addresses appearing in the depositary’s books. The redemption price per depositary share will be equal to the applicable fraction of the redemption price payable per share for the applicable series of the preferred stock. Whenever we redeem shares of preferred stock held by the depositary, the depositary will redeem the depositary shares representing the shares of preferred stock on the same day. If fewer than all the depositary shares of a series are to be redeemed, the depositary shares will be selected by lot or ratably as the depositary will decide.

After the date fixed for redemption, the depositary shares called for redemption will no longer be considered outstanding. Therefore, all your rights as holders of the depositary shares will cease, except that you will still be entitled to receive any cash payable upon the redemption and any money or other property to which you were entitled at the time of redemption.

Voting the Preferred Stock

How do you vote? The depositary will notify you of any upcoming vote and arrange to deliver our voting materials to you, if you are a holder of record at that time. The record date for determining if you are a holder of depositary shares is the same as the record date for the preferred stock. The materials you will receive will (1) describe the matters that are being submitted to a vote and (2) explain how you, on a certain date, may instruct the depositary to vote the shares underlying your depositary receipts as you direct. For instructions to be valid, the depositary must receive them on or before the date specified. The depositary will try, as far as practical, to vote the shares as you instruct. We agree to do anything the depositary asks us to do in order to enable it to vote as you instruct. If you do not instruct the depositary how to vote your shares, the depositary will abstain from voting those shares.

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Conversion or Exchange

What happens when we convert preferred stock into other securities, or exchange it for securities of another company? The depositary will convert or exchange all your depositary shares on the same day that the preferred stock underlying your depositary receipts is converted or exchanged. In order for the depositary to do so, we will need to deposit the other stock, common stock or other securities into which the preferred stock is to be converted or for which it will be exchanged.

The exchange or conversion rate per depositary share will be equal to:

The following are some more terms of conversions and exchanges that you should keep in mind:

The depositary shares, as such, cannot be converted or exchanged into other preferred stock, common stock, securities of another issuer or any other securities or property of us. Nevertheless, if so specified in the applicable prospectus supplement, you may be able to surrender the depositary receipts to the depositary with written instructions asking the depositary to instruct us to convert the preferred stock represented by the depositary shares into other shares of preferred stock or common stock of us or to exchange the preferred stock for securities of another issuer. If you have this right, we have agreed that we will cause the conversion or exchange of the preferred stock using the same procedures as we use for the delivery of preferred stock. If you are only converting part of your depositary shares represented by a depositary receipt, new depositary receipts will be issued for any depositary shares that you do not convert or exchange.

Amendment and Termination of the Deposit Agreement

How may the deposit agreement be amended? We may agree with the depositary to amend the deposit agreement and the form of depositary receipt without your consent at any time. However, if the amendment adds or increases fees or charges or prejudices an important right of holders, it will only become effective with the approval of holders of at least a majority of the affected depositary shares then outstanding. If an amendment becomes effective, and you continue to hold your depositary receipts, you are deemed to agree to the amendment and to be bound by the amended deposit agreement.

How may the deposit agreement be terminated? The deposit agreement automatically terminates if:

We may also terminate the deposit agreement at any time we wish. If we do so, the depositary will give you notice of termination not less than 30 days before the termination date. Once you surrender your depositary receipts to the depositary, it will send you the number of whole or fractional shares of the series of preferred stock underlying your depositary receipts.

Charges of Depositary and the Expenses

We will pay all transfer and other taxes and governmental charges in connection with the existence of the depositary arrangements. We will pay charges of the depositary for the initial deposit of the preferred stock and

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any redemption. You will pay other transfer and other taxes and governmental charges and the charges that are expressly provided in the deposit agreement to be for your account.

Limitations on Our Obligations and Liability to Holders of Depositary Receipts

The deposit agreement expressly limits our obligations and the obligations of the depositary to you. It also limits our liability and the liability of the depositary. We and the depositary:

In the deposit agreement, we and the depositary agree to indemnify each other under certain circumstances.

Resignation and Removal of Depositary

The depositary may resign at any time by notifying us of its election to do so. In addition, we may remove the depositary at any time. The resignation or removal will take effect when we appoint a successor depositary and it accepts the appointment. We must appoint the successor depositary within 60 days after delivery of the notice of resignation or removal and the new depositary must be a bank or trust company having its principal office in the United States and having a combined capital and surplus of at least $50,000,000.

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Description of Common Stock We May Offer

Our authorized share capital consists of 14,010,000,000 shares, of which 14,000,000,000 are common shares having a par value of $1.00 per share. As of January 31, 2025, 7,178,183,000 shares of common stock were outstanding. The common stock is listed on the New York Stock Exchange under the symbol “T”.

The following briefly summarizes the provisions of our restated certificate of incorporation and our bylaws that are important for you. Both documents are incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you can obtain them as described below in “Where You Can Find More Information”.

You should note that some of the provisions of our restated certificate of incorporation and our bylaws may tend to deter any potential unfriendly tender offers or other efforts to obtain control of us. At the same time, these provisions will tend to assure continuity of management and corporate policies and to induce any persons seeking control or a business combination with us to negotiate on terms acceptable to our then-elected board of directors.

General

All outstanding shares of common stock are, and any shares of common stock offered, when issued, will be fully paid and nonassessable.

We typically do not issue physical stock certificates. Instead, we record evidence of your stock ownership solely on our corporate records. However, we will issue a physical stock certificate to you if you so request.

Holders of common stock do not have any conversion, redemption, preemptive or cumulative voting rights. In the event of our dissolution, liquidation or winding-up, common stockholders share ratably in any assets remaining after all creditors are paid in full, including holders of our debt securities and after the liquidation preference of holders of preferred stock has been satisfied.

The transfer agent for the common stock is Computershare Trust Company, N.A., P.O. Box 505005, Louisville, Kentucky 40233.

Dividends

Common stockholders are entitled to participate equally in dividends when dividends are declared by our board of directors out of funds legally available for dividends.

Voting Rights

Each holder of common stock is entitled to one vote for each share for all matters voted on by common stockholders.

Election of Directors

Holders of common stock may not cumulate their votes in the election of directors. In an election of directors, each director must be elected by the vote of the majority of the votes cast with respect to that director’s election. If a nominee for director is not elected and the nominee is an incumbent director, such incumbent director must promptly tender his or her resignation to the board of directors, subject to acceptance by the board of directors. The Governance and Policy Committee of the board of directors (the “Governance and Policy Committee”) will make a recommendation to the board of directors as to whether to accept or reject the tendered resignation, or whether other action should be taken. The board of directors will act on the tendered resignation, taking into account the Governance and Policy Committee’s recommendation, and publicly disclose (by a press

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release, a filing with the SEC or other broadly disseminated means of communication) its decision regarding the tendered resignation and the rationale behind the decision within 90 days from the date of certification of election results. The Governance and Policy Committee in making its recommendation and the board of directors in making its decision may each consider any factors or other information that they consider appropriate and relevant. Any incumbent director who tenders his or her resignation following such failure to be elected will not participate in the recommendation of the Governance and Policy Committee or the decision of the board of directors with respect to his or her resignation.

If the number of persons properly nominated for election as directors as of the date that is 10 days before the record date for the meeting at which such vote is to be held exceeds the number of directors to be elected, then the directors shall be elected by a plurality of the votes cast.

For purposes of the election of directors, a majority of votes cast shall mean that the number of shares voted “for” the election of a director exceeds the number of votes cast “against” the election of such director.

Other Matters

Except with respect to the election of directors as described above, all other matters are determined by a majority of the votes cast, unless otherwise required by law or the certificate of incorporation for the action proposed.

For these purposes, a majority of votes cast shall mean that the number of shares voted “for” a matter exceeds the number of votes cast “against” such matter.

Quorum

At least 40% of the shares entitled to vote at the meeting must be present in person or by proxy, in order to constitute a quorum.

Board of Directors

Our bylaws provide that all directors are required to stand for re-election every year. At any meeting of our board of directors, a majority of the total number of the directors constitutes a quorum.

Action without Stockholder Meeting

Our restated certificate of incorporation also requires that stockholders representing at least two-thirds of the total number of shares outstanding and entitled to vote thereon must sign a written consent for any action without a meeting of the stockholders.

Advance Notice Bylaws

Our bylaws establish advance notice procedures with regard to stockholder proposals relating to the nomination of candidates for election as directors or new business to be brought before meetings of our stockholders. These procedures provide that notice of such stockholder proposals must be timely given in writing to the Secretary of AT&T prior to the meeting at which the action is to be taken. Generally, to be timely, notice must be received at our principal executive offices not less than 90 days nor more than 120 days prior to the anniversary date of the annual meeting for the preceding year. The notice must contain certain information, representations and agreements specified in the bylaws.

Proxy Access

Our bylaws permit any stockholder or group of up to twenty stockholders who have maintained continuous qualifying ownership of 3% or more of our outstanding common stock for at least the previous three years to

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include up to a specified number of director nominees in our proxy materials for an annual meeting of stockholders. The maximum number of stockholder nominees permitted under the proxy access provisions of our bylaws shall be the greater of two or 20% of the total number of directors of AT&T on the last day a notice of nomination may be submitted.

Notice of a nomination pursuant to the proxy access provisions of our bylaws must be submitted to the Secretary of AT&T at our principal executive office no earlier than 150 days and no later than 120 days before the anniversary of the date that we mailed our proxy statement for the previous year’s annual meeting of stockholders. The notice must contain certain information, representations and agreements specified in our bylaws.

Section 203 of the General Corporation Law of the State of Delaware

We are also subject to Section 203 of the General Corporation Law of the State of Delaware. Section 203 prohibits us from engaging in any business combination (as defined in Section 203) with an “interested stockholder” for a period of three years subsequent to the date on which the stockholder became an interested stockholder unless:

For purposes of Section 203, an “interested stockholder” is defined as an entity or person beneficially owning 15% or more of our outstanding voting stock, based on voting power, and any entity or person affiliated with or controlling or controlled by such an entity or person.

A “business combination” includes mergers, asset sales and other transactions resulting in financial benefit to a stockholder. Section 203 could prohibit or delay mergers or other takeover or change of control attempts with respect to us and, accordingly, may discourage attempts that might result in a premium over the market price for the shares held by stockholders.

Such provisions may have the effect of deterring hostile takeovers or delaying changes in control of management or us.

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Plan of Distribution

We may sell securities to purchasers directly, or through agents, dealers, or underwriters, or through a combination of any of those methods of sale.

The distribution of the securities may be made from time to time in one or more transactions at a fixed price or prices, which may be changed, at market prices prevailing at the time of sale, at prices related to these prevailing market prices or at negotiated prices.

The securities may be sold by us or by one or more of our subsidiaries that previously acquired the securities from us, from other of our subsidiaries, from third parties or in the open market. Any such subsidiary may be deemed to be an underwriter under the Securities Act of 1933.

Through Agents

We and the agents designated by us may solicit offers to purchase securities. Agents that participate in the distribution of securities may be deemed underwriters under the Securities Act of 1933. We will name any agent that will participate in the distribution of the securities, and any commission we will pay to it will be described in the applicable prospectus supplement. Any agent will be acting on a “best efforts” basis for the period of its appointment, unless we indicate differently in the applicable prospectus supplement.

To Dealers

The securities may be sold to a dealer as principal. The dealer may then resell the securities to the public at varying prices determined by it at the time of resale. The dealer may be deemed to be an underwriter under the Securities Act of 1933.

To Underwriters

The securities may also be sold to one or more underwriters and we will then execute an underwriting agreement with them at the time of sale. The names of the underwriters will be set forth in the prospectus supplement, which will be used by the underwriters to resell the securities.

Convertible, Redeemable and Exchangeable Securities

If we choose to offer debt securities or preferred stock that is convertible, redeemable or exchangeable into or for third-party securities, we will identify in the applicable prospectus supplement:

Indemnification

We may enter into indemnification agreements with underwriters, dealers, agents and other persons participating in the distribution of securities, who will then be entitled to indemnification by us against some civil liabilities. The indemnification covers liabilities under the Securities Act of 1933.

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Delayed Delivery Arrangements

We may authorize underwriters, dealers or other persons acting as our agents to solicit offers from a number of institutions to purchase securities from us. We will indicate our intention to do this in the applicable prospectus supplement. The contracts for these purchases will provide for payment and delivery on a future date or dates. These institutions include commercial and savings banks, insurance companies, pension funds, investment companies, educational and charitable institutions and others, and must be approved by us. The obligations of purchasers under these contracts will be unconditional, except that:

The underwriters, dealers and other persons will not have any responsibility for the validity or performance of these contracts.

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Validity of Securities

Unless otherwise indicated in the prospectus supplement, the validity of the securities offered by this prospectus will be passed upon for us by Bryan Hough, Assistant Vice President – Senior Legal Counsel and Assistant Secretary, and for any underwriters, dealers or agents, as the case may be, by Sullivan & Cromwell LLP, New York, New York. As of February 28, 2025, Bryan Hough owned less than 1% of the outstanding shares of AT&T. Sullivan & Cromwell LLP from time to time performs legal services for AT&T.

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Experts

The consolidated financial statements of AT&T appearing in AT&T’s Annual Report (Form 10-K) for the year ended December 31, 2024, and the effectiveness of AT&T’s internal control over financial reporting as of December 31, 2024, have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon, included therein, and incorporated herein by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such reports given on the authority of such firm as experts in accounting and auditing.

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Documents Incorporated by Reference

The SEC allows us to “incorporate by reference” the information we file with the SEC. This permits us to disclose important information to you by referring to these filed documents. Any information incorporated by reference is considered part of this prospectus, and any information we file with the SEC after the date of this prospectus will automatically update and supersede this information. We incorporate by reference the following documents and information filed with the SEC (other than, in each case, documents or information deemed to have been furnished and not filed in accordance with SEC rules):

To the extent that any information contained in any current report on Form 8-K, or any exhibit thereto, was furnished to, rather than filed with, the SEC, such information or exhibit is specifically not incorporated by reference in this prospectus.

We will provide without charge to each person, including any beneficial owner, to whom this prospectus is delivered, upon his or her written or oral request, a copy of any or all documents referred to above which have been or may be incorporated by reference into this prospectus excluding exhibits to those documents unless they are specifically incorporated by reference into those documents. You may make your request by calling us at (210) 821-4105, or by writing to us at AT&T, Attention: Stockholder Services, One AT&T Plaza, 208 South Akard Street, Dallas, Texas 75202.

When we refer to “we”, “our” or “us” in this prospectus we mean AT&T Inc. and its consolidated subsidiaries.

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Where You Can Find More Information

As required by the Securities Act of 1933, we filed a registration statement relating to the securities offered by this prospectus with the SEC. This prospectus is part of that registration statement, which includes additional information.

We file annual, quarterly and current reports, proxy statements and other information with the SEC. These SEC filings are available to the public from the SEC’s website at http://www.sec.gov. Those filings are also available to the public on, or accessible through, our website at http://www.att.com. The information contained on or accessible through our corporate website or any other website that we may maintain is not incorporated by reference herein and is not part of this prospectus or the registration statement of which this prospectus is a part. You may also inspect these reports and other information without charge at a website maintained by the SEC. The address of this site is http://www.sec.gov.

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PART II

Information Not Required in Prospectus

The following is a statement of the expenses (all of which are estimated) to be incurred by AT&T Inc. in connection with a distribution of an assumed amount of the securities being registered under this registration statement:

Section 145 of the Delaware General Corporation Law (“DGCL”) permits a corporation to indemnify its directors and officers against expenses, including attorneys’ fees, judgments, fines and amounts paid in settlements actually and reasonably incurred by them in connection with any action, suit or proceeding brought by third parties. The directors or officers must have acted in good faith and in a manner they reasonably believed to be in or not opposed to the best interests of the corporation and, with respect to any criminal action or proceeding, had no reasonable cause to believe their conduct was unlawful. In a derivative action, an action only by or in the right of the corporation, indemnification may be made only for expenses actually and reasonably incurred by directors and officers in connection with the defense or settlement of an action or suit, and only with respect to a matter as to which they shall have acted in good faith and in a manner they reasonably believed to be in or not opposed to the best interests of the corporation. No indemnification shall be made if such person shall have been adjudged liable to the corporation, unless and only to the extent that the court in which the action or suit was brought shall determine upon application that the defendant officers or directors are fairly and reasonably entitled to indemnity for such expenses despite such adjudication of liability.

We have adopted provisions in our Bylaws which provide that we will indemnify any person who was or is a party or is threatened to be made a party to any action, suit or proceeding, whether civil, criminal, administrative or investigative, including any action or suit by us or in our right, by reason of the fact that such person is or was our director, officer, employee, or, while such person is or was a director, officer or employee of us, is or was serving at our request as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise, against expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, but in each case only if and to the extent permitted under applicable state or federal law.

Our Bylaws further state that this indemnification shall not be deemed exclusive of any other right to which the indemnified person may be entitled, and shall continue as to a person who has ceased to be a director, officer, employee or agent and shall inure to the benefit of the heirs and personal representatives of that person.

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Our Restated Certificate of Incorporation provides that, consistent with Section 102(b)(7) of the DGCL, no director shall be liable to us or our stockholders for monetary damages for breach of fiduciary duty as a director, except for liability:

AT&T maintains policies insuring its officers and directors against certain civil liabilities, including liabilities under the Securities Act.

AT&T also entered into indemnification agreements with each of its officers and directors and anticipates that it will enter into similar agreements with future officers and directors. Generally, these agreements attempt to provide the maximum protection permitted by Delaware law with respect to indemnification. The indemnification agreements provide that AT&T will pay certain amounts incurred by its officers and directors in connection with any civil, criminal, administrative or investigative action or proceeding. Such amounts include any expenses, including attorney’s fees, judgments, civil or criminal fines, settlement amounts and other expenses customarily incurred in connection with legal proceedings.

We may also enter into indemnification agreements with underwriters providing that underwriters have to indemnify and hold harmless our company, each of our directors, each officer who signed the registration statement and any person who controls us within the meaning of the Securities Act, from and against certain civil liabilities, including liabilities under the Securities Act.

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The undersigned Registrant hereby undertakes:

To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

(i) to include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;

(ii) to reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered

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would not exceed that which was registered) and any deviation from the low- or high-end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) (§ 230.424(b) of this chapter) if, in the aggregate, the changes in volume and price represent no more than 20% change in the maximum aggregate offering price set forth in the “Calculation of Filing Fee Tables” or “Calculation of Registration Fee” table, as applicable, in the effective registration statement; and

(iii) to include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement; provided, however, that paragraphs (i), (ii) and (iii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the Registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

That, for the purpose of determining liability under the Securities Act of 1933 to any purchaser:

(A) Each prospectus filed by the Registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and

(B) Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5) or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii) or (x) for the purpose of providing the information required by Section 10(a) of the Securities Act of 1933 shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof; provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.

That, for the purpose of determining liability of the Registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities, the undersigned Registrant undertakes that in a primary offering of securities of the undersigned Registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned Registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

(i) Any preliminary prospectus or prospectus of the undersigned Registrant relating to the offering required to be filed pursuant to Rule 424;

II-4

(ii) Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned Registrant or used or referred to by the undersigned Registrant;

(iii) The portion of any other free writing prospectus relating to the offering containing material information about the undersigned Registrant or its securities provided by or on behalf of an undersigned Registrant; and

(iv) Any other communication that is an offer in the offering made by an undersigned Registrant to the purchaser.

That, for purposes of determining any liability under the Securities Act of 1933, each filing of the Registrant’s annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of such issue.

II-5

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Dallas, State of Texas, on the 28th day of February, 2025.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities indicated on the 28th day of February, 2025:

DIRECTORS:

Scott T. Ford*

Glenn H. Hutchins*

William E. Kennard*

Stephen J. Luczo*

Marissa A. Mayer*

Michael B. McCallister*

Beth E. Mooney*

Matthew K. Rose*

Cynthia B. Taylor*

Luis A. Ubiñas*

II-6

Exhibit 5

[LETTERHEAD OF AT&T INC.]

February 28, 2025

AT&T Inc.

208 S. Akard Street

Dallas, TX 75202

Dear Sirs:

With reference to the registration statement on Form S-3 (the “Registration Statement”) which AT&T Inc. (the “Corporation”) proposes to file with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Act”), relating to (i) senior debt securities of the Corporation (“Senior Debt Securities”) issuable in series under an Indenture, dated as of May 15, 2013, between the Corporation and The Bank of New York Mellon Trust Company, N.A., as Trustee, (ii) subordinated debt securities of the Corporation (“Subordinated Debt Securities” and together with the Senior Debt Securities, the “Debt Securities”) issuable in series under an Indenture to be executed between the Corporation and The Bank of New York Mellon Trust Company, N.A., as Trustee, (iii) shares of preferred stock, par value $1 per share, of the Corporation (“Preferred Stock”), (iv) depositary shares representing fractional interests in Preferred Stock (“Depositary Shares”), and (v) shares of common stock, par value $1 per share, of the Corporation (“Common Stock” and together with the Debt Securities, Preferred Stock and Depositary Shares, the “Securities”), I am of the opinion that:

1. The Corporation has been duly incorporated and is validly existing and in good standing under the laws of the State of Delaware.

2. Each series of the Debt Securities, when the Registration Statement has become effective under the Act and when such series is duly established by or pursuant to a resolution of the Board of Directors of the Corporation or in a supplemental indenture, in each case so as not to violate any applicable law or result in a default under or breach of any agreement or instrument to which AT&T Inc. is a party or by which it is bound, and duly executed, authenticated and issued as provided in the applicable Indenture and delivered against payment, will constitute valid and legally binding obligations of the Corporation entitled to the benefits of the applicable Indenture, subject to bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and similar laws of general applicability relating to or affecting creditors’ rights and to general equity principles.

3. The shares of Preferred Stock, when (A) the Registration Statement has become effective under the Act, (B) the Board of Directors of the Corporation (or a duly authorized committee thereof) has taken all necessary corporate action to approve the issuance and terms of the shares of Preferred Stock, the terms of the offering thereof, and related matters, in each case so as not to violate any applicable law or result in a default under or breach of any agreement or instrument to which the Corporation is a party or by which it is bound, including the adoption of a Certificate of Designation relating to such Preferred Stock (a “Certificate”) and the filing of the Certificate with the Secretary of State of the State of Delaware, and (C) certificates representing the shares of Preferred Stock have been duly executed, countersigned, registered and delivered either (i) in accordance with the applicable definitive purchase, underwriting or similar agreement approved by the Board of Directors of the Corporation (or a duly authorized committee thereof) and upon payment of the consideration therefor (not less than the par value of the Preferred Stock) provided for therein or (ii) upon conversion or exercise of any other security, in accordance with the terms of such security or the instrument governing such security providing for such conversion or exercise as approved by the Board of Directors of the Corporation (or a duly authorized committee thereof), for the consideration approved by the Board of Directors of the Corporation (or a duly authorized committee thereof) (not less than the par value of the Preferred Stock), will be validly issued, fully paid and nonassessable.

4. The Depositary Shares, when (A) the Registration Statement has become effective under the Act, (B) the Board of Directors of the Corporation (or a duly authorized committee thereof) has taken all necessary corporate action to approve the issuance and terms of the Depositary Shares, the terms of the offering thereof, and related matters, in each case so as not to violate any applicable law or result in a default under or breach of any agreement or

instrument to which the Corporation is a party or by which it is bound, (C) the Depositary Agreement or Agreements relating to the Depositary Shares and the related depositary receipts (“Depositary Receipts”) have been duly authorized and validly executed and delivered by the Corporation and the Depositary appointed by the Corporation, (D) the shares of Preferred Stock underlying such Depositary Shares have been duly authorized and validly issued and are fully paid and nonassessable as contemplated in paragraph (3) above and deposited with a bank or trust company (which meets the requirements for the Depositary set forth in the Registration Statement) under the applicable Depositary Agreements, and (E) the Depositary Receipts representing the Depositary Shares have been duly executed, countersigned, registered and delivered in accordance with the appropriate Depositary Agreement and the applicable definitive purchase, underwriting or similar agreement approved by the Board of Directors of the Corporation (or a duly authorized committee thereof) upon payment of the consideration therefor provided for therein, will be validly issued.

5. The Common Stock, when (A) the Registration Statement has become effective under the Act, (B) the Board of Directors of the Corporation (or a duly authorized committee thereof) has taken all necessary corporate action to approve the issuance of and the terms of the offering of the shares of Common Stock, and related matters, in each case so as not to violate any applicable law or result in a default under or breach of any agreement or instrument to which the Corporation is a party or by which it is bound, and (C) certificates representing the shares of Common Stock have been duly executed, countersigned, registered and delivered (or, in the case of uncertificated shares, the shares have been registered and a notice of their issuance has been delivered) either (i) in accordance with the applicable definitive purchase, underwriting or similar agreement approved by the Board of Directors of the Corporation (or a duly authorized committee thereof) upon payment of the consideration therefore (not less than the par value of the Common Stock) provided for therein or (ii) upon conversion or exercise of any security, in accordance with the terms of such security of the instrument governing such security providing for such conversion or exercise as approved by the Board of Directors of the Corporation (or a duly authorized committee thereof), for the consideration approved by the Board of Directors of the Corporation (or a duly authorized committee thereof) (not less than the par value of the Common Stock), will be validly issued, fully paid and nonassessable.

I note that, as of the date of this opinion, a judgment for money in an action based on a Debt Security denominated in a foreign currency or currency unit in a Federal or state court in the United States ordinarily would be enforced in the United States only in United States dollars. The date used to determine the rate of conversion of the foreign currency or currency unit in which a particular Debt Security is denominated into United States dollars will depend upon various factors, including which court renders the judgment. Under Section 27 of the New York Judiciary Law, a state court in the State of New York rendering a judgment on a Debt Security would be required to render such judgment in the foreign currency or currency unit in which the Debt Securities are denominated, and such judgment would be converted into United States dollars at the exchange rate prevailing on the date of entry of the judgment.

In rendering the foregoing opinion, I am not passing upon, and assume no responsibility for, any disclosure in any registration statement or any related prospectus or other offering material relating to the offer and sale of the Securities.

I hereby consent to the filing of this opinion with the Securities and Exchange Commission in connection with the filing of the Registration Statement referred to above and the making of the statements with respect to me which are set forth under the caption “Validity of Securities” in the prospectus forming a part of the Registration Statement referred to above.

In giving this consent, I do not thereby admit that I am within the category of persons whose consent is required under Section 7 of the Act, or the rules and regulations of the Securities and Exchange Commission.

Very truly yours,

/s/ Bryan Hough

Exhibit 23-a

Consent of Independent Registered Public Accounting Firm

We consent to the reference to our firm under the caption “Experts” in this Registration Statement (Form S-3) and related Prospectus of AT&T Inc. (AT&T) for the registration of senior debt securities, subordinated debt securities, preferred stock, depositary shares and common stock and to the incorporation by reference therein of our reports dated February 12, 2025, with respect to the consolidated financial statements of AT&T, and the effectiveness of internal control over financial reporting of AT&T, included in its Annual Report (Form 10-K) for the year ended December 31, 2024, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Dallas, Texas

February 28, 2025

Exhibit 24

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or registration statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or registration statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or registration statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or registration statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or registration statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or registration statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or registration statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or registration statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS:

THAT, WHEREAS, AT&T INC., a Delaware corporation, hereinafter referred to as the “Corporation”, proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Act of 1933, as amended, a Shelf Registration Statement on Form S-3 relating to the sale of the Corporation’s senior and subordinated debt securities, common stock, preferred stock, and depositary shares representing preferred stock; and

WHEREAS, each of the undersigned is an officer or director or an officer and director of the Corporation;

NOW, THEREFORE, each of the undersigned hereby constitutes and appoints John T. Stankey, Pascal Desroches, Sabrina Sanders, George B. Goeke, Ying (Elaine) Lou, or Andrew B. Keiser, or any one of them, the attorneys for the undersigned and in the undersigned’s name, place and stead, and in the undersigned’s office and capacity in the Corporation, to execute and file a registration statement or registration statements, and thereafter to execute and file any and all amended registration statements and amended prospectuses or amendments (including post-effective amendments) or supplements to any of the foregoing, hereby giving and granting to said attorneys full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and concerning the premises, as fully to all intents and purposes as the undersigned might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof.

IN WITNESS WHEREOF, the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.

Exhibit 25-a

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM T-1

STATEMENT OF ELIGIBILITY

UNDER THE TRUST INDENTURE ACT OF 1939

OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

(Exact name of trustee as specified in its charter)

AT&T Inc.

(Exact name of obligor as specified in its charter)

Senior Debt Securities

(Title of the indenture securities)

Yes.

If the obligor is an affiliate of the trustee, describe each such affiliation.

None.

Exhibits identified in parentheses below, on file with the Commission, are incorporated herein by reference as an exhibit hereto, pursuant to Rule 7a-29 under the Trust Indenture Act of 1939 (the “Act”).

- 2 -

- 3 -

SIGNATURE

Pursuant to the requirements of the Act, the trustee, The Bank of New York Mellon Trust Company, N.A., a banking association organized and existing under the laws of the United States of America, has duly caused this statement of eligibility to be signed on its behalf by the undersigned, thereunto duly authorized, all in the City of Pittsburgh, and State of Pennsylvania, on the 21st day of February, 2025.

- 4 -

EXHIBIT 7

Consolidated Report of Condition of

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

of 333 South Hope Street, Suite 2525, Los Angeles, CA 90071

At the close of business December 31, 2024, published in accordance with Federal regulatory authority instructions.

1

I, Shana Quinn, CFO of the above-named bank do hereby declare that the Reports of Condition and Income (including the supporting schedules) for this report date have been prepared in conformance with the instructions issued by the appropriate Federal regulatory authority and are true to the best of my knowledge and belief.

Shana Quinn  )   CFO

We, the undersigned directors (trustees), attest to the correctness of the Report of Condition (including the supporting schedules) for this report date and declare that it has been examined by us and to the best of our knowledge and belief has been prepared in conformance with the instructions issued by the appropriate Federal regulatory authority and is true and correct.

2

Exhibit 25-b

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM T-1

STATEMENT OF ELIGIBILITY

UNDER THE TRUST INDENTURE ACT OF 1939

OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

(Exact name of trustee as specified in its charter)

AT&T Inc.

(Exact name of obligor as specified in its charter)

Subordinated Debt Securities

(Title of the indenture securities)

Yes.

If the obligor is an affiliate of the trustee, describe each such affiliation.

None.

Exhibits identified in parentheses below, on file with the Commission, are incorporated herein by reference as an exhibit hereto, pursuant to Rule 7a-29 under the Trust Indenture Act of 1939 (the “Act”).

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SIGNATURE

Pursuant to the requirements of the Act, the trustee, The Bank of New York Mellon Trust Company, N.A., a banking association organized and existing under the laws of the United States of America, has duly caused this statement of eligibility to be signed on its behalf by the undersigned, thereunto duly authorized, all in the City of Pittsburgh, and State of Pennsylvania, on the 21st day of February, 2025.

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EXHIBIT 7

Consolidated Report of Condition of

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

of 333 South Hope Street, Suite 2525, Los Angeles, CA 90071

At the close of business December 31, 2024, published in accordance with Federal regulatory authority instructions.

1

I, Shana Quinn, CFO of the above-named bank do hereby declare that the Reports of Condition and Income (including the supporting schedules) for this report date have been prepared in conformance with the instructions issued by the appropriate Federal regulatory authority and are true to the best of my knowledge and belief.

Shana Quinn  )   CFO

We, the undersigned directors (trustees), attest to the correctness of the Report of Condition (including the supporting schedules) for this report date and declare that it has been examined by us and to the best of our knowledge and belief has been prepared in conformance with the instructions issued by the appropriate Federal regulatory authority and is true and correct.

2