Airtel is the most sucessful telecom operator in the indian telecom market.its a bharti group of company brand.i use this network last 4 years, not bad at all.
Network: the airtel network is not bad, I used this netwok on my mobile in prepaid plan, its awesome, and data speed is airtel network is good.calling network is good, but more work to do their calling network.
Customer service: the airtel customer service is well.they do their work is well, any problem of network issue or data issue they try to satisfy their customer problem quickly.i think this aim is good.
Charges and bilings: airtel prepaid plan are good, because I was a prepaid subscribers so, I know that the prepaid plan are good and not very high chargeble.their data and calling plan are be good benefeted by customer.