AT&T, headquartered at Whitacre Tower, Dallas, Texas, US, is one of the leading telecommunications corporations in the current precinct. The American based multinational is the pioneer in the mobile industry and telecommunications. Started in 1983, previously it was known as Southwestern Bell Corporation from 1983-1995 and SBC Communications Inc. from 1995-2005. Only recently it has recognized as AT&T Inc.
Being the third largest company in Texas, AT&T is listed as the 23 largest corporations in terms of revenue generation and market value. With over 250 million customers, AT&T proudly stands as one of the leading telecommunication corporation on the globe.