It is the first indian open nerwork.airtel network is very nice network which gives very best service in whole india.only one network which gives full network any where out side where no any company network available.but airtel is always present.its tariff are also good.i use airtel network very long time and I satisfied.i lived at very out side near the forest where no any network but airtel gives service in this area so I love very hearty .and like so much.its plan is also nice for use and save money.