Tata docomo mobile operators are a well known company but they don’t provide the good network strength. When I used to use tata docomo I didn’t receive more than one network bar inside my house. And when you are travelling then the whole network gets vanished and all you will see is emergency service written in place of operator’s name.
Their customer service is pathetic, I called to them and told about my network issue a lot of time, every they said they will solve the problem as soon as possible but there was no improvement.
There is no free roaming in Tata docomo and they charge a lot while you are in roaming and there no good offer for roaming as well. So finally I had to change my operator