Hi friends, i am using airtel for more than 7 years and I love to share my experience with you.the first thing I experienced that the network coverage. you can find full network even in under water.its internet service is also so great. you can find lots of chota(paper/easy) recharge to surf internet like 8/-, 12/-, 18/-, 25/- etc(west bengal circle). the company is also very innovative.
I mean airtel money, internet sharing, talktime sharing and lots of thing were first invented by Airtel. though it is a little expensive but it will help almost every where.