Never go for Airtel 4G! You dont even get 2G speed and their support and service is pathetic! Only lip service with excuses are provided without any action being taken to improve the speed!
I had to move the modem across all vantage points in my house to get an optimum speed and even then there is lot of fluctuation in the connectivity! The maximum I got was 3Mbps and now it has come down to less than 1Mbps!