TCIL is operating Cellular Telephone Services in Rajasthan Circle through BHARTI HEXACOM LTD., a Joint Venture promoted by TCIL and now working in partnership with Bharti Televentures Ltd. of New Delhi. Presently the company has subscriber base of over 2.00 million with over 30% market share. TCIL has a share-holding of 30% in this company with investment of Rs. 106.20 crore. The JV Company has achieved a turnover of Rs. 1849.06 crore and PBT of Rs. 413.51 crore upto March, 2009. TCIL investment in the JV has been increased from Rs. 91.26 crore to Rs. 106.20 crore in August' 2008 with the JV's right issue at a premium of Rs. 50 per share.

Tamil Nadu Telecommunications Ltd (TTL), which is the public limited company promoted by TCIL and Tamilnadu Industrial Development Corporation Ltd, has done well in the past two years primarily because of the steady growth in JFT and OFC cables. In 2000-01, it grew from a total turnover of Rs 63.04 crore to Rs 113 crore. The bulk of its revenue has come from the JFT cables. The prime market for its products has been DoT and in order to ensure that it continues to bag the orders, TTL has also acquired the ISO 9002 certification and increased its capacity. This, the company believes, will also help in fetching it more export orders. The company is diversifying into the manufacture of high value optical fiber cables by entering into a joint venture with Fujikura Limited, Japan, which will provide technological inputs for optical fiber cables.

INTELLIGENT COMMUNICATION SYSTEMS INDIA LTD., is a joint venture of Telecommunication Consultants India Ltd. (TCIL), a govt. of India enterprise, under ministry of communications & IT and Delhi State Industrial and Infrastructure Development Corporation (DSIIDC), an undertaking of Delhi government. From 1987, the year of its inception, it has provided exemplary service in the IT sector, specializing in providing complete solutions in computerization, networking and telecommunication. With a well focused vision and a global mission, ICSIL look at greener pastures across the globe. ICSIL focuses on IT training, BTS Training & Installation, Trading of Telecom & other equipments, External Plant Network, E-governance Solutions etc.

TBL is a joint venture of Telecommunications Consultants India Limited, (TCIL) and BellSouth International(BSI), USA. TCIL is promoted by the Department of Telecommunications, Government of India. It has tremendous experience and expertise in providing telecom project consultancy and executing turnkey projects. It operates in Asia, Africa, Europe, Australia and the Middle East. TCIL's mission is to be a leading world class software company that provides cost effective high quality products and services to serve the global market place in the rapidly advancing telecom and information technology environment.

TCIL has formed a Joint Venture Company in KSA styled as "TCIL SAUDI CO. LTD. (TSCL)" wherein TCIL's equity is 40% with investment of Rs. 67 lakh. NATEL, the other partner is having 60% equity. NATEL has expressed desire to leave the JVC as partner. Pending their replacement by another suitable partner, the JVC has made an arrangement with NATEL that TCIL shall execute the projects in the name of TSCL and shall be responsible for the profits and losses while NATEL shall have no say in the Management and NATEL shall be paid a sponsorship fee of 3% to 5% of value of such contracts. As such, turnover obtained through TSCL has been merged with TCIL operations. Besides TSCL operations, TCIL in its own name is also executing projects. The company has achieved a turnover of Rs. 31.86 crore and profit of Rs. 2.53 crore upto March, 2009.

TCIL in association with Mahanagar Telephone Nigam Limited (MTNL), Videsh Sanchar Nigam Limited (VSNL) and Nepal Ventures Pvt.Ltd. (NVPL) formed the JV Company called United Telecom Ltd. The Company has been awarded a license for providing Basic Telecom Services in the Kingdom of Nepal based on CDMA technology for providing Wireless in Local Loop. UTL has launched its services in September, 2003. The Company has achieved a turnover of Rs. 39.81 crore upto March, 2009.