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AT&T Inc. 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. AT&T 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 May 2013, AT&T is the 21st largest company in the world by market value, and the 13th largest non-oil company. As of 2013, it is also the 21st largest mobile telecom operator in the world, with over 107.9 million mobile customers.
Telephone Exchange is a Boise, ID-based company in the Telecommunications sector.
CTG Corp is a Bellevue, WA-based company in the Telecommunications sector.
Manx Telecom is the Isle of Mans leading telecommunications provider. Core services include fibre broadband, pay monthly and pay as you go mobile, and hardware.
Westelcom is a Watertown, NY-based company in the Telecommunications sector.