I got very bad experiences with tata docomo.
1 ) No coverage- for this operator, you do not get coverage in most of the areas. I am living in Pune city, then also I face many network problem for tata docomo.
2) Charging for nothing:- Few days back I got charged for SMS service, which I am not using and not activated by me. When I call service center, the answers were like, you have activated it and like that. After that they even not responding to my call. Very poor service.