AT&T Inc. ( used to be called American Telegraph & Telephone ) is the largest provider of both local and long distance telephone services , wireless service , and Internet access in the United States with 71.4 million customers . AT&T Inc. is the largest provider of fixed telephony in the United States , and also provides broadband and subscription television services . As of 2011 , AT&T is the largest provider of mobile telephony service in the United States , with over 95.5 million wireless customers , just ahead of Verizon Wireless ' 94.1 million , and more than 210 million total customers .