Recently I have ported from airtel to bsnl. Largest mobile network in india after bsnl. When I started using mobile in 2009 I was having airtel as we dont have other choice. One thing I found good is network frequency is better than vodafone. Leaving aside everything is too worst. Auto vas activated automatically, hellotune auto save, balance deducted without any reason, high internet package & offers. Thanks to jio that create such a revolution that airtel bends & brought down the offers. No one is going to choose those offers we have better option to use.