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T-Mobile is a mobile network operator headquartered in Bonn, Germany. It is a subsidiary of Deutsche Telekom and belongs to the FreeMove Business alliance.

T-Mobile is a group of mobile phone corporate subsidiaries (all under the ownership of Deutsche Telekom) that operate GSM and UMTS networks in Europe and the United States. The "T" stands for "Telekom." T-Mobile also has financial stakes in mobile operators in Central and Eastern Europe. Globally, T-Mobile has 128.3 million subscribers, making it the world's seventh largest mobile phone service provider by subscribers and the third largest multinational after the United Kingdom's Vodafone and Spain's Telefónica. T-Mobile USA is the fourth largest wireless telecommunications network in the U.S. market with 32.1 million customers after Verizon Wireless, AT&T Mobility, and Sprint Nextel.

T-Mobile International has a substantial presence in eleven European countries (Austria, Croatia, Czech Republic, Germany, Hungary, the Republic of Macedonia, Montenegro, the Netherlands, Poland, Slovakia, and the United Kingdom) as well as in the United States.

T-Mobile USA is the United States based subsidiary of T-Mobile International AG. T-Mobile USA is currently the fourth-largest wireless carrier in the U.S. market with approximately 32 million customers as of August 2007 and annual revenue of US$17 billion.

The U.S. T-Mobile network predominately uses the GSM/GPRS 1900 MHz frequency-band, making it the largest 1900 MHz network in the United States. Service is available in 98 of the 100 largest markets and 268 million potential customers.

Headquartered at 12920 Se 38th St, Bellevue, WA 98006-1350 in Factoria, Bellevue, WA, the U.S. company was previously known as VoiceStream Wireless or Powertel. In July 2001, VoiceStream was acquired by Deutsche Telekom for US$50.7 billion, and in September 2002 changed the company name nationally to T-Mobile.

On September 17, 2007, T-Mobile USA announced the acquisition of SunCom Wireless for US$2.4 billion. The acquisition expanded the network coverage to North Carolina, South Carolina, Tennessee, Georgia, Puerto Rico and the U.S. Virgin Islands. At the end of the second quarter of 2007, SunCom had more than 1.1 million customers. The deal closed on February 22, 2008.