I have been using TATA DOCOMO from last five months and it is the worst Mobile Network I have seen. I raised the Problem with TATA Docomo they have no resolution for it.
They will tell to switch to their alliance network BPL Mobile or Aircel. OnAircel SMS is not working as Aircel have not paid to Vodafone hence Vodafone has stop the SMS service for Aircel.
If you want to talk on TATA Docomo then you will have to be on road because their network works only on raods, not in Offices and buildings.
Good for beggars, Rag pickers, who lives on Foot path.
Never go with TATA DOCOMO otherwise your life will be miserable and you will be always unreachable.