| Name | Country | Market Cap (US$) |
|---|
| Sunrise Communications AG | Switzerland | Private |
| Sunrocket Inc | United States | Private |
| Sunwest Communications Inc | United States | Private |
| Sure-Tel, Inc | United States | Private |
| SureWest Telephone Company | United States | Private |
| Surfnet B.V. | Netherlands | Private |
| Sutherland Group Canada Corp, The | Canada | Private |
| Svenska Umts-Nät AB | Sweden | Private |
| Svi Systems, Inc | United States | Private |
| Svyaz of Komi republic | Russia | Private |
| Svyazinform of Penza Region | Russia | Private |
| Svyazinform of Samara Region | Russia | Private |
| Swedia Networks Ab | Sweden | Private |
| Swefour AB | Sweden | Private |
| Swift Response Inc | United States | Private |
| SWISSVOICE SA | France | Private |
| Sybase 365 Ltd. | United Kingdom | Private |
| Sygnet Wireless, Inc | United States | Private |
| Sympatico of Bell Canada | Canada | Private |
| Symphony Telecom Ltd | United Kingdom | Private |
| Synchron Communications, Inc. | United States | Private |
| Syniverse Technologies, Inc. | United States | Private |
| Sytex, Inc | United States | Private |
| T C G Delaware Valley Inc | United States | Private |
| T-Mobile Austria Gmbh | Austria | Private |
| T-Mobile HotSpot GmbH | Germany | Private |
| T-Mobile International AG | Germany | Private |
| T-Mobile Magyarorszag Tavkozlesi Reszvenytarsasag "beolvadassal | Hungary | Private |
| T-Mobile Slovensko a.s. | Slovakia | Private |
| T-Mobile USA, Inc. | United States | Private |
| T-ONLINE FRANCE | France | Private |
| T-Systems North America Inc | United States | Private |
| T-SYSTEMS TELECOMMUNICATION SCE FRANCE | France | Private |
| Tachyon, Inc. | United States | Private |
| Tadiran Telecommunications Ltd. | Israel | Private |
| Taide Network AS | Norway | Private |
| Talk America Holdings Inc | United States | Private |
| TALKTALK DIRECT LTD | United Kingdom | Private |
| Tambov Electrosvyaz | Russia | Private |
| Tata Cellular Limited. | India | Private |
| TATA TELESERVICES LIMITED | India | Private |
| Tata Teleservices Limited | India | Private |
| Tavant Technologies Inc | United States | Private |
| Tcast Communications, Inc | United States | Private |
| TCG New York, Inc. | United States | Private |
| TCI Ventures Group | United States | Private |
| TCNZ AUSTRALIA INVESTMENTS PTY LIMITED | Australia | Private |
| Tcnz Australia Pty Ltd | Australia | Private |
| Tdc Carrier Services Usa, Inc | United States | Private |
| Tdc Dotcom AB | Sweden | Private |
| TDC Mobil A/S | Denmark | Private |
| Tdc Song AB | Sweden | Private |
| Tdc Song AS | Norway | Private |
| Tdc Song AS | Norway | Private |
| TDC Totallosninger A/S | Denmark | Private |
| TDS Metrocom, LLC | United States | Private |
| Tds Telecom Service Corporation | United States | Private |
| Technology Solutions Group Inc | United States | Private |
| Telasa Celular S/A. | Brazil | Private |
| Telcel | Mexico | Private |
| Telcel Celular CA | Venezuela | Private |
| Telcell S.A. | Brazil | Private |
| Telco Group, Inc | United States | Private |
| Telco Services GmbH | Germany | Private |
| Telcove Inc | United States | Private |
| TelDaFax AG | Germany | Private |
| Tele Nordeste Celular | Brazil | Private |
| Tele-Fibernet Corporation | United States | Private |
| Tele.Ring Telekom Service Gmbh | Austria | Private |
| Tele2 (Netherlands) B.V. | Netherlands | Private |
| Tele2 A/S | Denmark | Private |
| TELE2 EESTI A S | Estonia | Private |
| TELE2 ITALIA SPA | Italy | Private |
| Tele2 Norge AS | Norway | Private |
| Tele2 SIA | Latvia | Private |
| Tele2 Sverige AB | Sweden | Private |
| Tele2 Syd AB | Sweden | Private |
| Tele2UTA Telecommunications GmbH | Austria | Private |
| Teleacre Celular S/A. | Brazil | Private |
| Telebahia Celular S/A. | Brazil | Private |
| Telecable De Asturias, S.A. | Spain | Private |
| Telecom Americas Ltd | Brazil | Private |
| Telecom Developpement | France | Private |
| Telecom Direct Ltd | United Kingdom | Private |
| TELECOM EIREAN U K | United Kingdom | Private |
| TELECOM ENGINEERING SERVICES LIMITED | Republic of Ireland | Private |
| Telecom FL Aktiengesellschaft | Liechtenstein | Private |
| Telecom Italia Finance, S.A. | Luxembourg | Private |
| Telecom Italia Sparkle Of North America Inc | United States | Private |
| TELECOM ITALIA SPARKLE SPA | Italy | Private |
| TELECOM NEW ZEALAND INTERNATIONAL AUSTRALIA PTY LIMITED | Australia | Private |
| Telecom New Zealand Limited | New Zealand | Private |
| Telecom Pacific Limited | New Zealand | Private |
| Telecom Personal S.A. | Argentina | Private |
| Telecominvest OAO | Russia | Private |
| Telecommunicatiebedrijf Suriname | French Guiana | Private |
| Telecomunicac. da Bahia (TELEBAHIA) | Brazil | Private |
| Telecomunicacao do Ceara | Brazil | Private |
| Telecomunicaciones de Guatemala | Guatemala | Private |
| Telecomunicaciones Movilnet CA | Venezuela | Private |
|
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