Airtel brand is always my best brand its all servics are very good.its mobile service are awsome .network of airtel are every where either a rare place of any rare village, and service quality of airtel network is strong with no calldrop and voice lag.its net conectivity is also very very good, recently I used airtel 4g service, I was surprised to see its downloding and surfing speed, so I suggest to use always airtel