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T-Mobile (UK) boasts about 17 million customers for its wireless telephone network. A subsidiary of Germany's Deutsche Telekom, its core services are voice calling and text messaging in the UK, as well as international calling. T-Mobile (UK) also has about half a million subscribers to its mobile Internet services which include email, Web browsing, and video. It sells primarily to consumers both online and through retail shops located throughout the UK. Along with affiliates in Germany and Poland, T-Mobile (UK) is one of its parent's largest European wireless businesses. Formerly a subsidiary of T-Mobile International, the company became a direct subsidiary of Deutsche Telekom following a 2009 restructuring.

Taiwan Mobile provides wireless and fixed-line voice and data telecommunications services, as well as business networking and cable television services in Taiwan. The company sells prepaid and postpaid local and long-distance wireless voice calling and messaging services, broadband Internet access, and pay television through a network of retail outlets, franchises, and affiliates and subsidiaries. Taiwain Mobile also distributes mobile devices and accessories from such global electronics vendors as Samsung, Research in Motion, and Sony Ericsson. The company serves enterprise clients through Taiwan Mobile Business Solutions division.

Tata Teleservices (TTSL) provides telecommunications services to about 58 million clients in thousands of towns and villages across India. Among its services are mobile and wireline telephone (under the Tata Indicom brand), fixed wireless phones (Walky), and public booth telephony. The company also provides wired and mobile Internet services and conferencing. TTSL has sales and distribution partnerships with such equipment providers as Motorola and ECI Telecom. It also provides additional wireless phone service through joint ventures with UK-based provider Virgin Mobile and Japan-based NTT DoCoMo. The company, founded in 1996, is a subsidiary of conglomerate Tata Group.

Tatara Systems sells equipment and software that allow communications service providers to deliver converged (voice, video, and data) wireless services to their customers. Its servers and client software support roaming partnerships, customer authentication, and network monitoring. The company markets its system, called the Mobile Services Convergence Platform, to mobile operators, telephone companies, cable system operators, and aggregators. Customers include BT Group, Bell Mobility, O2, and Vodafone Group. Established in 2001, Tatara Systems has received venture funding from Highland Capital Partners and North Bridge Venture Partners.

TCI International finds loose lips before they sink the wrong ships. The company is a developer of broadband products for broadcasting, communications intelligence collection, specialized radio communications, and spectrum management. Its Broadcast and Communications Group provides high-power broadcasting antennas for a variety of military and civilian use. The TCI Signal Processing Group designs and manufactures spectrum monitoring equipment, direction finding, and signal collection products for military and intelligence uses, as well as for use by regulatory authorities. The company also provides engineering, installation, and integration services. TCI International is a subsidiary of SPX Corporation.

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