Hello,
I am using tata docomo from past 3 years.mostly I use it because of its 3g service.it was first company after bsnal in my are which provide 3g.its 3g rates are cheaper.and speed is amazing.but .main disadvantage when we go out of station or some village area.there is no coverage.so it is not useful for person who likes more travelling.we can use only for general local use.calling rates are average.we have to select some scheme for better benefits.bt u can try its 3g speed