I have been using Tata docomo postpaid for last 5 plus years now.
It is very economic for people in middle class. Tata docomo provides very good and friendly customer service.
Tata docomo network is very good. It does not work in parking basements. It also does not work in parking elevators. But other places network is very good. They provide very good email and call center support 24 hours.
Tata docomo has very good messaging, conference calls, internet pack and other wonderful value added services.