I have been using tata docomo from many years. They provide very great packs at cheaper price as compared to other operators. They are been the very favourite for onnet calls as they provide the same as in an unvariable low price as compared to other network operators.
The internet packs are also been provided at a very nominal cost. The only thing which bothers me about the docomo was the network problem. The network inside the home is fairly very poor and people need to come outside their home to make a call. If docomo improves their network problem it will be a very nice choice among all operators.