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                                                                     EXHIBIT 5.1

                               [AT&T LETTERHEAD]

                                 April 18, 2001

AT&T Corp.
32 Avenue of the Americas
New York, New York 10013

Dear Sirs:

     With reference to the registration statement on Form S-4, Registration No.
333-52670 (the "Registration Statement") that AT&T Corp. (the "Company") has
filed with the Securities and Exchange Commission under the Securities Act of
1933, as amended, relating to 503,018,108 shares of the Company's Wireless Group
common stock, par value $1.00 per share (the "AT&T Wireless Group tracking
stock"), I am of the opinion that:

     1.   the Company is a duly organized and validly existing corporation
          under the laws of the State of New York;

     2.   the issuance of the AT&T Wireless Group tracking stock has been duly
          authorized by appropriate corporate action of the Company; and

     3.   when the AT&T Wireless Group tracking stock has been issued and
          delivered in the manner described in the Registration Statement,
          such AT&T Wireless Group tracking stock will be validly issued, fully
          paid and non-assessable.

     I hereby consent to the filing of this opinion with the Securities and
Exchange Commission in connection with the filing of the Registration
Statement. I also consent to the making of the statement with respect to me in
the Registration Statement under the heading "Legal Matters."

                                        Very truly yours,

                                        /s/ Robert S. Feit
                                        ________________________________________
                                        Robert S. Feit
                                        General Attorney and Assistant Secretary