Airtel has been one of the oldest network providing companies in india but I personally feel that it has never taken a step to improve its network connections worldwide. i’m an iphone user and the I go through a lot of betwork problems like sometimes the other persons phone ring could be heard only after 5-7 minutes u start calling that person. It seems that 4G is only for name sake and for the service that they should provide , it has a very slow speed of the internet and the connectivity is also not that good to rely upon , it literally takes me almost an hour or sometimes more than that only to download an 1 GB application. The service and support is only good if we are at the store but service online is not that good. I would suggest you not to go with airtel as it could breakdown any moment .