Tata DOCOMO is an Indian cellular service provider on the GSM, CDMA and platform-arising out of the strategic joint venture between Tata Teleservices and NTT Docomo in November 2008. It is the country's sixth largest operator in terms of subscribers (including both GSM and CDMA).Fast growing network. On 2015 spectrum auction tata docomo won 10 mhz frequency bandwidth in tamilnadu circle