Tata Docomo’s gsm network I have used 2 years back. At that time after purchasing the sim they gave some special offers I contined for 3 months. in between these days some times they deduct the money without reason. And also there is no network coverage at my home town, when I went to my home from hyderabad I got many problem because of the poor network. And after completing of 3 months my call rates are hanged and im not intreasted in the network. so I changed to the vodafone by MNP. now this netwotk is good for me. And also there is a rumor about this network if we use net in the mobile, lot of mobiles got many hanging problems. that is real or not I dont know exactly.