| Twenty Seven Telecom Limited | | Live |
| UMIX Telecom Co., LIMITED | Private company limited by shares | Live |
| Unicell Telecom Limited | Private company limited by shares | Live |
| UNICOM TELECOM HK LIMITED | Private company limited by shares | Live |
| UNIFIED TELECOM COMPANY LIMITED | Private company limited by shares | Live |
| UNIGLOBE TELECOM (FAR EAST) LIMITED | Private company limited by shares | Dissolved |
| UNI-LINK TELECOM & NETWORKS LIMITED | Private company limited by shares | Dissolved |
| UNIMAX TELECOM LIMITED | Private company limited by shares | Dissolved |
| TELECOM UNION LIMITED | Private company limited by shares | Dissolved |
| UNITECH TELECOM (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| UNITED TELECOM LIMITED | Private company limited by shares | Live |
| HK UNITED TELECOM LIMITED | Private company limited by shares | Live |
| CHINASIN UNITED TELECOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| PACIFIC UNITED TELECOM CO., LIMITED | Private company limited by shares | Live |
| SUPER UNITED TELECOM LIMITED | Private company limited by shares | Live |
| UNIVERSAL TELECOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL TELECOM LIMITED | Private company limited by shares | Live |
| UNIVERSAL HT TELECOM LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL TELECOM HK CO. LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL TELECOM ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL TELECOM (HOLDING) LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL TRADING COMPANY (TELECOM) LIMITED | Private company limited by shares | Dissolved |
| TELECOM UNIVERSE, LIMITED | Private company limited by shares | Live |
| UNIVERSE TELECOM LIMITED | Private company limited by shares | Dissolved |
| UNIVERSE INTERNATIONAL TELECOM LIMITED | Private company limited by shares | Dissolved |
| Smart Universe Telecom Limited | Private company limited by shares | Live |
| UNIVISION TELECOM LIMITED | Private company limited by shares | Dissolved |
| UNLIMITED TELECOM LIMITED | Private company limited by shares | Live |
| China Uotocom International Telecom Group Limited | Private company limited by shares | Live |
| UPGRADE TELECOM LIMITED | Private company limited by shares | Dissolved |
| U-PHONE TELECOM (HONGKONG) LIMITED | Private company limited by shares | Live |
| UTONE TELECOM LIMITED | Private company limited by shares | Live |
| UTTA TELECOM CO., LIMITED | Private company limited by shares | Live |
| VAAYAA TELECOM LIMITED | Private company limited by shares | Live |
| Vasav Telecom Limited | Private company limited by shares | Live |
| VAVO TELECOM LIMITED | Private company limited by shares | Live |
| VBEEBOX TELECOM LIMITED | Private company limited by shares | Dissolved |
| VEGA TELECOM LIMITED | Private company limited by shares | Dissolved |
| VEGA TELECOM LIMITED | Private company limited by shares | Live |
| VENES TELECOM LIMITED | Private company limited by shares | Dissolved |
| TRIDENT TELECOM VENTURES LIMITED | Private company limited by shares | Dissolved |
| FIRST TRIDENT TELECOM VENTURES LIMITED | Private company limited by shares | Dissolved |
| VERGE TELECOM LIMITED | Private company limited by shares | Dissolved |
| VICTORY TELECOM LIMITED | Private company limited by shares | Live |
| Top Victory Telecom Company Limited | Private company limited by shares | Live |
| VIETEL TELECOM LIMITED | Private company limited by shares | Dissolved |
| GRAND VIEW PRO TELECOM LIMITED | Private company limited by shares | Live |
| VINOVO TELECOM (HK) INCORPORATION LIMITED | Private company limited by shares | Live |
| VISION TELECOM LIMITED | Private company limited by shares | Live |
| ADVANCED VISION TELECOM LIMITED | Private company limited by shares | Live |
| VOCOM TELECOM LIMITED | Private company limited by shares | Dissolved |
| ONE VOICE TELECOM LIMITED | Private company limited by shares | Live |
| GLOBAL VOICE TELECOM HK LIMITED | Private company limited by shares | Live |
| VoIP Innovations Telecom Limited | Private company limited by shares | Live |
| VOIZ TELECOM LIMITED | Private company limited by shares | Live |
| VOKIFONE TELECOM GROUP LIMITED | Private company limited by shares | Dissolved |
| VOREX TELECOM LIMITED | Private company limited by shares | Live |
| Voxpace Telecom Limited | Private company limited by shares | Live |
| VOXUS TELECOM LIMITED | Private company limited by shares | Dissolved |
| VSTAR TELECOM TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| WAFER TELECOM LIMITED | Private company limited by shares | Dissolved |
| WAHWAI TELECOM LIMITED | Private company limited by shares | Live |
| Wakaka Telecom Limited | Private company limited by shares | Live |
| TELECOM GREAT WALL DEVELOPMENT COMPANY LIMITED | Private company limited by shares | Dissolved |
| WALTON (TELECOM) LIMITED | Private company limited by shares | Dissolved |
| WANG YIP TELECOM LIMITED | Private company limited by shares | Live |
| WANG TAT TELECOM LIMITED | Private company limited by shares | Live |
| WangYi Telecom Tech Co., Limited | Private company limited by shares | Live |
| WAYSTRONG TELECOM COMPANY LIMITED | Private company limited by shares | Live |
| WAYSTRONG (HONG KONG) TELECOM COMPANY LIMITED | Private company limited by shares | Live |
| Weida Telecom Limited | | Live |
| Skyward Telecom Weighing Limited | | Live |
| WEIPHONE TELECOM LIMITED | Private company limited by shares | Live |
| WEIZHEN TELECOM LIMITED | Private company limited by shares | Live |
| WELCOME TELECOM LIMITED | Private company limited by shares | Dissolved |
| WELL TELECOM LIMITED | Private company limited by shares | Live |
| Well Power Telecom Limited | Private company limited by shares | Live |
| ROYAL WELL TELECOM LIMITED | Private company limited by shares | Dissolved |
| WELLDLED TELECOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| Wellink Telecom Trading Limited | Private company limited by shares | Live |
| Wellook telecom company Limited | | Live |
| WeMobile Telecom Limited | Private company limited by shares | Live |
| West Telecom CO Limited | | Live |
| EAST WEST TELECOM LIMITED | Private company limited by shares | Dissolved |
| West Revolution Telecom Limited | | Live |
| WHAMPOA TELECOM LIMITED | Private company limited by shares | Dissolved |
| WIDE WAY TELECOM COMMUNICATION TECHNOLOGY TRADING COMPANY LIMITED | Private company limited by shares | Dissolved |
| WELL WIDE TELECOM LIMITED | Private company limited by shares | Live |
| WIFI TELECOM LIMITED | Private company limited by shares | Live |
| WILLIE TELECOM LIMITED | Private company limited by shares | Dissolved |
| Telecom Wimax Limited | Private company limited by shares | Live |
| WIN2000 TELECOM LIMITED | Private company limited by shares | Live |
| WINCORE TELECOM LIMITED | | Live |
| Windsor Telecom Limited | | Live |
| WINFAX TELECOM LIMITED | Private company limited by shares | Live |
| WINFORD TELECOM LIMITED | Private company limited by shares | Live |
| WING WAI TELECOM CO. LIMITED | Private company limited by shares | Live |
| TAT WING TELECOM CO. LIMITED | Private company limited by shares | Dissolved |
| WINGO TELECOM LIMITED | Private company limited by shares | Live |
| WINGTECH TELECOM LIMITED | Private company limited by shares | Live |