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In the United States, T-Mobile is a cellular telecommunications provider. It is wholly owned by Deutsche Telekom, itself based in Bonn, Germany, as part of its T-Mobile division. It was formed from 4 U.S. companies, VoiceStream Wireless, Aerial, Omni Point and Powertel (VoiceStream acquired Aerial, Omnipoint and Powertel before T-Mobile acquired it). In May 2001, VoiceStream was acquired by Deutsche Telekom for US$24 billion, and in September 2002 the combined U.S. company's name changed to T-Mobile. Headquartered in Bellevue, Washington, T-Mobile USA is currently the fourth-largest wireless carrier in the U.S. market, behind Verizon Wireless, AT&T Mobility and Sprint Nextel with 33.62 million customers as of the end of the second quarter of 2010 and annual revenue of US$21.53 billion for their 2009 fiscal year.