Hyderabad, July 16 - Tata Docomo, joint venture between Tata Teleservices and NTT Docomo of Japan, completed the rollout of its GSM operations in south India with the formal launch in Andhra Pradesh Thursday.

Andhra Pradesh is the sixth circle where Tata Docomo has launched its GSM telephony operations.

Tata Teleservices managing director Anil Sardana told a news conference here that the pan-India rollout would be completed by October, for which the company has earmarked an investment of $2 billion.

During the last fortnight, Tata Docomo launched operations in Chennai, Tamil Nadu, Kerala and Karnataka. With the launch in Andhra Pradesh, it has completed the south Indian rollout in three weeks.

Tata Docomo has also commenced operations in Orissa.

NTT Docomo, which has 26 percent stake in the company, will provide technological and service differentiation.

'NTT Docomo has provided technical inputs to make Tata Docomo GSM network world class,' said Toshinari Kunieda, senior vice-president and managing director of the japanese firm's global business division, in a video message.