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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of 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, Debra L. Dial, George B. Goeke, Jeston B. Dumas, or Andrew B. Keiser, or any one of them, in all of the City of Dallas and State of Texas, 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, 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, each of the undersigned has hereunto executed this Power of Attorney on the date set forth opposite their name.