I’m using Airtel since 2005. I don’t know anything about old times but as smartphone began to still out, Airtel is the only network that has picked up steam.
The next generation 4G is available only on this network at 3G price. Wynk music, My Airtel, etc. app offers are exclusively available for Airtel users ( eg. Download all airtel apps and get 1.2 GB data free) .