Airtel is one of the most popular mobile network operator because there is network everywhere as compared to other network operators and also other network will not cover some village places but airtel network is there and also they have started giving 3g sevices in our village. I am really surprised about that.
But, the thing its lacking in is thier much higher call rates as compared to other networks. Otherwise its has an awesome network with good speed, if they make it cheaper then it will be very usefull.