| Name | Country | Market Cap (US$) |
|---|
| Telkom Kenya Ltd | Kenya | Private |
| Tellabs Denmark A/S | Denmark | Private |
| TELLAS S.A. | Greece | Private |
| Telmex Argentina S.A. | Argentina | Private |
| Telmex Colombia S.A. | Colombia | Private |
| Telmex Colombia S.A. | Colombia | Private |
| TELMEX PERU S.A. | Peru | Private |
| Telmex Usa Llc | United States | Private |
| Telmore A/S | Denmark | Private |
| Telpa Celular S/A. | Brazil | Private |
| Telpe Celular S.A. | Brazil | Private |
| Telstra Europe Ltd | United Kingdom | Private |
| Telstra New Zealand Holdings Ltd. | New Zealand | Private |
| Terabeam Corporation | United States | Private |
| Terra Network Brasil S/A. | Brazil | Private |
| Terra Telecommunications Corp | United States | Private |
| Tess S/A. | Brazil | Private |
| Thales Telecommunications Services Ltd | United Kingdom | Private |
| The Bahamas Telecommunications Company Ltd | Bahamas | Private |
| The Bermuda Telephone Company Limited | Bermuda | Private |
| THE CARPHONE WAREHOUSE SERVICES LTD | United Kingdom | Private |
| The Chester Telephone Company | United States | Private |
| The Concord Telephone Long Distance Company | United States | Private |
| The Ken Blanchard Companies | United States | Private |
| The Mobile Solution Corporation | United States | Private |
| The Night Shift Answering Service Limited | Canada | Private |
| The Number UK Limited | United Kingdom | Private |
| The Southern New England Telephone Company Inc | United States | Private |
| The Sytex Group Inc | United States | Private |
| The Woodbury Telephone Company | United States | Private |
| THUS GROUP PLC | United Kingdom | Private |
| Tigo | Paraguay | Private |
| Tim Celular S/A. | Brazil | Private |
| Timerwell Technology (Taiwan) Co., Ltd. | Taiwan | Private |
| TIMES INTERNET LIMITED | India | Private |
| TKC Communications | United States | Private |
| Tll Partners Llc | United States | Private |
| Tm Cellular Sdn Bhd | Malaysia | Private |
| Tm Net Sdn Bhd | Malaysia | Private |
| TNL PCS S/A. | Brazil | Private |
| TOHOKU INTELLIGENT TELECOMMUNICATION CO.,INC. | Japan | Private |
| Tokyo Telecommunication Network Co. | Japan | Private |
| Toledo Area Telecommunications Services, Inc | United States | Private |
| Tom Online Inc. | Hong Kong | Private |
| Tomsktelecom | Russia | Private |
| Top Express Telecommunication (Services) Limited | Hong Kong | Private |
| Total World Telecommunications, Inc. | United States | Private |
| Totem Communications Ltd | United Kingdom | Private |
| Touch Tone America, Inc. | United States | Private |
| TowerStream Corporation | United States | Private |
| TOYO NETWORK SERVICES CORPORATION | Japan | Private |
| TPG Internet Pty Ltd | Australia | Private |
| TracFone Wireless, Inc. | United States | Private |
| Trade Wind Communications Limited | Australia | Private |
| TRADINGCOM EUROPE | France | Private |
| TRANSACTION NETWORK SERVICES (U K) LTD | United Kingdom | Private |
| Transaction Network Services, Inc | United States | Private |
| Transasia Telecommunications Inc. | Taiwan | Private |
| Transcall America Inc | United States | Private |
| Translations.Com, Inc | United States | Private |
| Transmode Systems AB | Sweden | Private |
| Transtel Communications, Inc | United States | Private |
| Transtel S.A. | Colombia | Private |
| TransTeleCom, JSC | Russia | Private |
| Tri-M Communications, Inc | United States | Private |
| Triangle Telephone Cooperative Association Inc | United States | Private |
| Tribune Interactive Inc | United States | Private |
| Tricom S.A. | Dominican Republic | Private |
| Tricom Usa, Inc | United States | Private |
| Trillion Digital Communication Inc | United States | Private |
| Trintel Communications Inc | United States | Private |
| Triton Cellular Partners of Lincoln LLC | United States | Private |
| Triton Communications L.L.C. | United States | Private |
| Triton P C S Holdings Company L.L.C. | United States | Private |
| Triton Pcs Operating Company Llc | United States | Private |
| Trivergent Corporation | United States | Private |
| Trivo Wireless, LLC | United States | Private |
| TROPOLYS Netz GmbH | Germany | Private |
| Trueposition, Inc | United States | Private |
| Tsc Communications, Inc | United States | Private |
| Tu-Ka Cellular Tokai Inc. | Japan | Private |
| Tu-Ka Cellular Tokyo,Inc. | Japan | Private |
| Tu-Ka Phone Kansai Inc. | Japan | Private |
| Tucows.Com Co | Canada | Private |
| TUNSTALL HOLDINGS LTD | United Kingdom | Private |
| TuWay Wireless | United States | Private |
| TV 1000 Norge AS | Norway | Private |
| Twenty4Help Knowledge Service B.V. | Netherlands | Private |
| Txu Investment Company | United States | Private |
| Tz Holdings, Inc | United States | Private |
| U S Cellular Inc | United States | Private |
| U S WEST Communications Federal Srvs | United States | Private |
| U S WEST, Inc. | United States | Private |
| U.S. Digital Communications, Inc. | United States | Private |
| U.S. TelePacific Holdings Corp | United States | Private |
| U.S. Telepacific Holdings Corp | United States | Private |
| U.S. Wireless Corporation | United States | Private |
| Ubiquitel Inc | United States | Private |
| UE ACCESS PTY LTD | Australia | Private |
| UKRAINIAN MOBILE COMMUNICATIONS Closed Joint Stock Company | Ukraine | Private |
|
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