AT&T
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AT&T

AT&T Inc. is an American multinational telecommunications corporation, headquartered at Whitacre Tower in downtown Dallas, Texas. AT&T is the second largest provider of mobile telephone and the largest provider of fixed telephone in the United States, and also provides broadband subscription television services. AT&T is the third-largest company in Texas. As of May 2014, AT&T is the 23rd-largest company in the world as measured by a composite of reve...

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