T-Mobile UK

T-Mobile UK was a mobile network operator in the United Kingdom, owned by Deutsche Telekom since 1999, and originally launched as Mercury One2One. In 2009, Deutsche Telekom and Orange SA announced that the T-Mobile network was to be merged with Orange UK in a joint venture, EE Limited to form the UK's largest mobile network. EE continued to offer services under the T-Mobile brand until February 2015, when these were withdrawn in favour of EE plans.

T-Mobile International AG is a German holding company for Deutsche Telekom AG's various mobile communications subsidiaries outside Germany. Based in Bonn, Germany, its subsidiaries operate GSM, UMTS and LTE-based cellular networks in Europe, the United States, Puerto Rico and the U.S. Virgin Islands. The company has financial stakes in mobile operators in both Central and Eastern Europe.