When I bought mobile for the first time first operator that was first active in our region was airtel .At first intance it looked costly but on getting the service I was more than happy to pay the charge whatever they have fixed . call quality is of great quality . Now moving on to the other section internet . Till now I am using their internet services and one thing that I am happy with that is the speed of the data services . Their 3G service is way better than many of the 4g service providers . Although service is costly but it is worth your money.