I have been using tata docomo from last 3 years,
Docomo is having very poor network coverage. When you go to some villages in maharsshtra it has no network at all.In city area also network is poor.
Tata docomo is very poor in customer care, first of all pone doesnt get connected to customer care.Customer care people doesnt provide proper feedback also.One thing positive about tata docomo is internet.It keeps giving offers on internet usually 1 gb 3g data at 135 rs.onlyDownloading speed is even better