AT&T

Ranked #89 on the list Best Operating System Developer of All Time

5.00
Based on 2 votes

About AT&T

  • Operating Systems Developed: UNIX System V

AT&T Inc. (also stylized as ATT and at&t; NYSE: T, for "telephone") is an American multinational telecommunications corporation headquartered in Whitacre Tower, downtown Dallas, Texas. AT&T is the largest provider both of mobile telephony and of fixed telephony in the United States, and also provides broadband subscription television services. As of 2010, AT&T is the seventh largest company in the United States by total revenue, and the fourth largest non-oil company (behind Walmart, General Electric, and Bank of America). It is the third-largest company in Texas (the largest non-oil company, behind only ExxonMobil and ConocoPhillips, and also the largest Dallas company). As of 2011, AT&T is the 14th largest company in the world by market value, and the 9th largest non-oil company. It is also the 20th largest mobile telecom operator in the world, with over 100.7 million mobile customers. AT&T Inc. began its existence as Southwestern Bell Corporation, one of seven Regional Bell Operating Companies created in 1983 in the divestiture of parent company AT&T Corp. due to the United States v. AT&T antitrust lawsuit. (AT&T Corp. was founded 1885 as the American Telephone and Telegraph

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