T-Mobile USA

T-Mobile USA is a cellular telecommunications provider and the United States based subsidiary of T-Mobile International AG, itself based in Bonn, Germany. The US company was previously known as VoiceStream Wireless or Powertel. In May 2001, VoiceStream was acquired by Deutsche Telekom for US$24 billion, and in September 2002 changed the company name nationally to T-Mobile. Headquartered in Factoria, Bellevue, Washington, T-Mobile USA is currently the fourth-largest wireless carrier in the U.S. market with 32.1 million customers as of the end of the second quarter 2008 and annual revenue of US$17.1 billion for their 2006 fiscal year.

T-Mobile USA tends to compete on price and advertises heavily to the youth market. Historically, they have also pioneered new features; they were the first U.S. carrier to launch a ringback tones service nationally (CallerTunes), video messaging and "HiFi Ringers" (ringtones which are clips of an actual song).
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AT&T Mobility LLC (usually branded AT&T, and formerly named Cingular Wireless LLC) is the wholly owned wireless subsidiary of AT&T Inc. AT&T Mobility is the largest mobile phone company (in terms of number of subscribers) in the United States, ahead of Verizon Wireless. AT&T Mobility has approximately 72.9 million subscribers as of the third quarter 2008.

Formerly a joint venture between SBC Communications and BellSouth, Cingular Wireless soon acquired the old AT&T Wireless; SBC later acquired the original AT&T and re-branded as "the new AT&T". Cingular became wholly-owned by the new AT&T in December 2006 as a result of AT&T’s acquisition of BellSouth.

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