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AT&T Inc., an abbreviation for its former name, the American Telephone and Telegraph Company, is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. [ 4 ] It is the world's third largest telecommunications company by revenue and the third largest wireless carrier in the United ...
A telephone exchange name or central office name was a distinguishing and memorable name assigned to a central office. It identified the switching system to which a telephone was connected, and facilitated the connection of telephone calls between switching systems in different localities. While small towns and rural areas might each be served by a single exchange, large cities were served by ...
Houston Cellular was a Houston -based cell phone company which provided AMPS and D-AMPS (TDMA) service in the Greater Houston area. It was formed in 1983 and was operated as a partnership between LIN Broadcasting Corp., Mobile Communication Corp. of America and BellSouth Co. [1] Its headquarters were located in Houston, Texas. [2] Through a series of acquisitions and mergers, within 10 years ...
AT&T, T-Mobile, Verizon, Boost Mobile, and UScellular also sell SIM cards through their retail channels, both in-store and online. The top five wireless providers operate nationwide wireless networks which cover most of the population in the United States, while smaller carriers provide native network coverage across selected regions of the ...
Comcast Corporation, formerly known as American Cable Systems and then Comcast Holdings, [ note 1 ] is a multinational telecommunications and media conglomerate incorporated and headquartered in Philadelphia.
United States Cellular Corporation (doing business as UScellular and formerly known as U.S. Cellular) is an American mobile network operator. Its stock is publicly traded, but Telephone and Data Systems Inc. owns a controlling stake (83% economic and 96% voting power). The company was formed in 1983 and is headquartered in Chicago, Illinois. UScellular is the fifth-largest wireless carrier in ...
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