Airtel is the one of the biggest network provider in india, Airtel has a very good network coverage, since 2013 I am using airtel I didnt face any network issues with airtel ther is only one problem with airtel is that its plans are very high price, if you want recharge a data plan of 100mb then you have to spend around 20rs and you will get only 3days validity in same way in telenor if u spend RS 14 you will get around 250mb and some times you get 500mb also with 15days validity. its network is excelent but tarrif plans are very high