File 33-57745
                                                                  Rule 424(b)(2)


PROSPECTUS SUPPLEMENT
(To Prospectus dated September 15, 1999)                 [GRAPHIC OMITTED]




                                 439,386 Shares

                                   AT&T CORP.

                                  Common Stock
                                   ----------


         This  prospectus  supplement  relates to  439,386  shares of our common
stock, par value $1.00 per share, issued to the shareholders of Louisiana Mobile
Systems,  Inc. in connection with our  acquisition of the outstanding  shares of
stock of  Louisiana  Mobile  Systems,  Inc. We acquired  all of the  outstanding
shares of  Louisiana  Mobile  Systems,  Inc.,  effective  November 1, 1999 for a
purchase  price  of  $19,319,269.88   through  a  merger  of  our  wholly  owned
subsidiary,  AT&T Wireless Louisiana  Acquisitions,  Inc., into Louisiana Mobile
Systems, Inc.

         Our  common  stock is quoted on The New York Stock  Exchange  under the
symbol  "T." The last  reported  sale price of the common  stock on The New York
Stock Exchange on October 29, 1999 was $46 3/4 per share.

         Neither the Securities and Exchange Commission nor any state securities
commission  has approved or disapproved  of these  securities,  or determined if
this prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.


           The date of this prospectus supplement is November 1, 1999.