Airtel is the first operator in india which is going to launch the 4g services in allover India. The best part is they are still providing the 4g service at 3g internet plans I am using the 4g service on my 4g ready device. Another part about airtel is the plans and offers there are lots of plans for 3g as well as for local calling.
Just few days ago airtel also introduce that the internet pack be launching with lifetime validity apart from this you can also share internet data with up to 5 friends which is the best part that I like.