Airtel is the best operator in India it is on top of all from last many year. This operator is available most part of India than other it is providing service to all indian users very well.
Since its cost rate is somewhat high but it can be ignored with what it providing even latest technology is always first introduced by airtel like you can see that 4G is launched in India first of all and till now no other operator launch it so you can see that it is best and the range of coverage is also very large so you can use it.
It is best. Moreover it gives offer in join with various mobile when you buy new one like currently it is in join with apple so it is good who want great coverage.