I am using airtel from last three years and services are good .I didnt had any problem using airtel any time.Sometimes the network coverages gives problems with it gets solves quickly .Their internet services are also good . I was very happy when they launch airtel 4G .it has launched new schemes like airtel to airtel calls are free and no charges will be their on inetrnational incoming calls . The calling and messaging are also good the voice comes clear even if their is low network coverage.their coustermer care also gives services quick in time. It also has different schemes on data packs.so it is good card to buy might be airtel will lauch new schemes which will be more attractive.