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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.
NET100 is a Chantilly, VA-based company in the Telecommunications sector.
Access2Go is a Peoria Heights, IL-based company in the Telecommunications sector.
APT Networks is a Tulsa, OK-based company in the Telecommunications sector.
Themailcom Inc is a Manchester, NH-based company in the Telecommunications sector.