Airtel is the best and stable network provider in India. The internet speed over 3g is also fastest among all networks. 4g network is also good. You can also see the network list provided by airtel. The main drawback of airtel is that their call rates are much higher and almost each service provided from them is very costly when compared to others. The network will be available at many places .The call quality is good. The internet plans are very costlier and also there are less offers unlike others.
But yes overall the best network.