Bharti airtel who is leading mobile network provider in india is really best service ptovider among the all. Be honest airtel is the only service provider who tries to besy to resolve all the problems of costemer and tries the best towards providing service. However it is not cheaper as reliance or any other in some area of rechrge but have full dedication towards fulfillilg the requirements of customers.
In my opinion airtel is best among all because of having many unique features which is not seen in other telecom service provider.