I had 2 sim of tata docomo but unwillingly I had to port those sims to airtel. tata docomo has very poor network in UP and is not available in UP west or delhi NCR.
where it is, there also the network is not available most of the time. no doubt it has wonderful schemes but if there is no network you cant do anything with the schemes.
I would strongly recommend you to port your sim to some reliable network like airtel, vodafone, idea, etc. like I did.