Currently using this network of tata docomo gsm prepaid.The network signals are not good as we go to some far places from the city.Mine is 2G network and iam feed up with the its internet speed it is very slow and takes much time to upload a photo.
The only advantages are the talktime time plans and the rate cutters etc., I think it should be must more improved in its network connectivity also so I suugest you to buy a 3g network only!