I am using airtel simcard in last 10 years old .my personal experience is airtel best network in india. Airtel operator well Airtel operator is good network service good in marketing and it provides you of wild range of network and it has never let me down yes network also its almost everywhere . I love this service provider very much because it catches tower every where I need& the net speed is also good both in 2G& 3G. I personaly using Airtel. In Whole india the airtel network is avilable . where are you go the network is also come with you Airtel launched airtel 4G the very high speed internet. I recomend airtel is best.