| HONG KONG TELECOM NETWORK SERVICES LIMITED | Private company limited by shares | Dissolved |
| Macroview Telecom Services Limited | Private company limited by shares | Live |
| MAXCOM TELECOM SERVICES LIMITED | Private company limited by shares | Live |
| GOLD MEDAL TELECOM SERVICES LIMITED | Private company limited by shares | Dissolved |
| PACIFIC TELECOM SERVICES COMPANY LIMITED | Private company limited by shares | Dissolved |
| WISDOM TELECOM CONSULTANCY & SERVICES PVT. LIMITED | Private company limited by shares | Live |
| SPEEDA TELECOM SERVICES LIMITED | Private company limited by shares | Dissolved |
| STAR TELECOM SERVICES LIMITED | Private company limited by shares | Live Commenced dormancy on 22-Nov-2002 |
| SUNNY TELECOM SERVICES LIMITED | Private company limited by shares | Live |
| Pan Telecom ATM Systems and Services Limited | Private company limited by shares | Live |
| UNIQUE TELECOM SERVICES LIMITED | Private company limited by shares | Dissolved |
| SETEC TELECOM TECHNOLOGY (HK) LIMITED | Private company limited by shares | Dissolved |
| SHAH Telecom Limited | Private company limited by shares | Live |
| Shark Telecom Limited | Private company limited by shares | Live |
| SHARON TELECOM LIMITED | Private company limited by shares | Live |
| SHARP TELECOM LIMITED | Private company limited by shares | Dissolved |
| SHARP TELECOM SERVICE LIMITED | Private company limited by shares | Dissolved |
| SHAUN TELECOM LIMITED | Private company limited by shares | Live |
| Shebataki Telecom Limited | Private company limited by shares | Live |
| SHENG LI TELECOM LIMITED | Private company limited by shares | Live |
| YU SHENG TELECOM LIMITED | | Live |
| Hong Kong Shengbo Telecom Limited | | Live |
| HK SHIHONG TRADE TELECOM LIMITED | Private company limited by shares | Live |
| SHINECITY TELECOM LIMITED | Private company limited by shares | Dissolved |
| SHINECITY TELECOM BD LIMITED | Private company limited by shares | Live |
| SHING TAI TELECOM COMPANY LIMITED | Private company limited by shares | Live |
| WAN SHING TELECOM LIMITED | Private company limited by shares | Live |
| Shing Telecom Limited | Private company limited by shares | Live |
| WAI SHING TELECOM CO., LIMITED | Private company limited by shares | Dissolved |
| Yu Shing Telecom (Hong Kong) Co., Limited | Private company limited by shares | Live |
| YUNG SHING TELECOM LIMITED | Private company limited by shares | Dissolved |
| SHREE TELECOM CO., LIMITED | Private company limited by shares | Live |
| Shrine Telecom Service Co., Limited | Private company limited by shares | Dissolved |
| Shuangbao Telecom Company Limited | | Live |
| SHUANGZHI Telecom LIMITED | Private company limited by shares | Live |
| Kam Shui Telecom Limited | Private company limited by shares | Live |
| JIN SHUO INTERNATIONAL TELECOM LIMITED | Private company limited by shares | Dissolved |
| SICHO TELECOM (HK) LIMITED | Private company limited by shares | Live |
| ONE SIDE TELECOM (HOLDING) LIMITED | Private company limited by shares | Dissolved |
| SIFA TELECOM LIMITED | Private company limited by shares | Live |
| SIGNAL TELECOM CO. LIMITED | Private company limited by shares | Dissolved |
| SIGNAL NETWORK TELECOM LIMITED | Private company limited by shares | Dissolved |
| SIGTO TELECOM (H.K.) LIMITED | Private company limited by shares | Dissolved |
| Silver Fox Telecom Limited | Private company limited by shares | Live |
| Simtoo Telecom China Co. Limited | Private company limited by shares | Live |
| SINCERE TELECOM LIMITED | Private company limited by shares | Live |
| SUN SING TELECOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| TIN SING TELECOM LIMITED | Private company limited by shares | Live |
| SING FAI TELECOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| SING NGAI TELECOM & COMPUTER COMPANY LIMITED | Private company limited by shares | Live |
| Hong Kong Sing Hop Telecom Company Limited | | Live |
| SING LEE (ISDN) TELECOM LIMITED | Private company limited by shares | Dissolved |
| TUNG SING TELECOM COMPANY LIMITED | Private company limited by shares | Dissolved |
| SINKO TELECOM (HK) CO., LIMITED | Private company limited by shares | Dissolved |
| Sino Telecom Co., Limited | Private company limited by shares | Live |
| SINO TELECOM (HK) LIMITED | Private company limited by shares | Live |
| SINO TELECOM INTERNATIONAL (HK) LIMITED | Private company limited by shares | Live |
| TELECOM SINO (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| SINO TELECOM SERVICES COMPANY LIMITED | Private company limited by shares | Live |
| SINO TECH TELECOM LIMITED | Private company limited by shares | Dissolved |
| SINO-LINK TELECOM LIMITED | Private company limited by shares | Dissolved |
| SINOST TELECOM LIMITED | Private company limited by shares | Dissolved |
| Sinovo Telecom Co., Limited | Private company limited by shares | Live |
| SiteTalk Telecom Limited | Private company limited by shares | Dissolved |
| SKYLINE TELECOM HK LIMITED | Private company limited by shares | Live |
| SKYLINE TELECOM LIMITED | Private company limited by shares | Live |
| SKYLINK TELECOM LIMITED | Private company limited by shares | Dissolved |
| CIXI SKYLINK TELECOM FACTORY LIMITED | Private company limited by shares | Live |
| SkyNet Telecom Limited | Private company limited by shares | Dissolved |
| Skynet Telecom Company Limited | Private company limited by shares | Live |
| SKYONE TELECOM CO. LIMITED | | Live |
| SKYROCK TELECOM NETWORK CO., LIMITED | Private company limited by shares | Live |
| SKYTECH TELECOM LIMITED | Private company limited by shares | Dissolved |
| SKYWARD TELECOM HK LIMITED | Private company limited by shares | Live |
| SKYWAY TELECOM CO., LIMITED | Private company limited by shares | Live |
| HONG KONG SKYWORLD TELECOM CO., LIMITED | Private company limited by shares | Live |
| NEW SMART TELECOM LIMITED | Private company limited by shares | Live |
| SUN SMART TELECOM LIMITED | Private company limited by shares | Live |
| BD SMART TELECOM LIMITED | Private company limited by shares | Live |
| WIN SMART TELECOM LIMITED | Private company limited by shares | Live |
| SMART TELECOM LIMITED | Private company limited by shares | Live |
| Smart Key Telecom Limited | Private company limited by shares | Live |
| Smart Ant Telecom Limited | | Live |
| Smart Care Telecom Limited | | Live |
| SMARTWIN TELECOM LIMITED | Private company limited by shares | Dissolved |
| SMILE TELECOM TECHNOLOGY CO., LIMITED | Private company limited by shares | Dissolved |
| Snsent Telecom Limited | Private company limited by shares | Live |
| S.O.E. TELECOM LIMITED | Private company limited by shares | Dissolved |
| Jaky Software and Telecom Limited | Private company limited by shares | Live |
| SOHO TELECOM LIMITED | Private company limited by shares | Live |
| IMX TELECOM SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| BPI TELECOM SOLUTIONS LIMITED | Private company limited by shares | Dissolved |
| Acel Telecom Solutions Limited | | Live |
| EastGate Telecom & Solutions Limited | Private company limited by shares | Live |
| SONIC TELECOM LIMITED | Private company limited by shares | Dissolved |
| Sonic Telecom (HK) Limited | Private company limited by shares | Live |
| NEW SONIC INTERNATIONAL TELECOM LIMITED | Private company limited by shares | Live |
| SOOWOO TELECOM LIMITED | Private company limited by shares | Live |
| SOUNDTECH TELECOM LIMITED | Private company limited by shares | Dissolved |
| ONE SOURCE TELECOM HONG KONG LIMITED | Private company limited by shares | Live |