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.

TCL Corporation brings ringtones to the ears of the people. The company, which does most of its business in China, is one of that country's leading makers of cell phones and televisions. It also makes other household appliances, computers, wireline telephones, and components such as light switches and cabling. TCL has technology partnerships with Microsoft and Intel. The company, established in 1981 as maker of cassette tapes, is owned primarily by the Chinese city of Huizhou. Other investors include Philips and Toshiba. TCL sells its products in more than 40 countries under its own brand, as well as the Alcatel, RCA, and THOMSON brands. TCL is adding sales of Toshiba-brand products through a JV with that company.

The Great Dane of telecom, TDC is the leading telecommunications network operator in Denmark. The company provides wireless, domestic local and long-distance landline, international, Internet, and cable television services to about 12 million consumer and commercial customers. TDC's international holdings include stakes in telecommunications companies in the Nordic region, but the bulk of sales are made in Denmark. The company serves 3 million customers in Switzerland (its second largest market in terms of sales) through its Sunrise Communications subsidiary. Investment group Nordic Telephone Company owns 88% of TDC; Nordic Telephone Company is a subsidiary of Luxembourg-based Angel Lux Parent.

Callers, clickers, and cable aficionados connect with Tele2. The pan-European telecommunications network operator provides fixed-line and mobile phone services, data transmission, and Internet access to nearly 30 million customers in 11 countries. Outside of Sweden, its top markets are Russia and the Netherlands, while nations in the Nordic, Baltic, and northern European regions round out Tele2's service area. Wireless services make up well over half of total sales. Other Tele2 units provide systems integration services (Datametrix) and cable television broadcasting (Kabelvision). Swedish investment group Investment AB Kinnevik owns 30% of the company and controls 48% of the voting rights.

Ericsson opens all lines of communication. The world's leading maker of mobile broadband infrastructure gear provides the equipment that telecom carriers use to build and expand networks. The company also provides wireline broadband, metro area Ethernet, and optical transport equipment. Its services unit handles operations ranging from systems integration to network management. Ericsson's multimedia arm provides content-related products such as Internet television systems. The company's joint venture with Sony, Sony Ericsson Mobile Communications, ranks among the top providers of cell telephones. Another joint venture with ST Microelectronics, ST-Ericsson, makes semiconductors mainly for wireless applications.

Telefonica O2 Germany, a subsidiary of UK-based wireless carrier Telefonica O2 Europe (owned by Spain's Telefonica), primarily provides mobile voice and data telecommunications services to about 14 million subscribers in Germany. Wireless subscribers are split nearly evenly between postpaid contracts and prepaid customers. The company also provides fixed-line Internet and other data services to more than 200,000 subscribers. It sells directly and through communications and retail partners including HanseNet, Fonic, and Schlecker. Telefonica O2 Germany sells pre-paid service under the Tchibo Mobilfunk name through a joint venture with Tchibo. Telefonica also operates in the Czech Republic, Ireland, and Slovakia.

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