Airtel telecomm service (Bharthi AirTel) - the best

In GSM mobile service the network coverage of bharthi airtel is good and thier customer care support too
If airtel service detect any fare(charge) wrongly for not using any service(say gprs ,call,message) if we explain the real and proper situation they 'll refund the amount which they detected by mistake(I got refund 3 times)
But in vodafone no refund 'll be given(I tried a lot)

But in cdma service reliance network coverage has no alternative(THE best)secondly to tata service(only cdma)

For GSM - AirTel
CDMA - Reliance

my top 5
Airtel(all)
Reliance(all)
TATA(all)
BSNL(all but exception)
Vodafone(network alone good)


This info is based my experience in my loclity area(around tamilnadu,chennai,tirunelveli)
Overall india i dont have info(sorry!!!)