TATA DOCOMO good network operator. I am using it from last 4 years. Its 3g service is pretty good and 3g packs are also bit feasible. Sometimes its network is out of service but good network coverage at public areas. It always has some exciting internet pack offers.
Docomo is the most economical internet provider buttt.its network coverage is bad in areas out of the city.its speed is not same everytime.