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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.
Panhandle Telephone Coop., Inc is one of the leading companies in Telecommunications industry. Panhandle Telephone Coop., Inc is based in Guymon, OK. You can find more information on Panhandle Telephone Coop., Inc at www.ptci.net
Navigation Tech Intl Corp is a Santa Clara, CA-based company in the Telecommunications sector.
Hong Enterprises is a Sunnyvale, CA-based company in the Telecommunications sector.
Call Center International is a Troy, MI-based company in the Telecommunications sector.