I have been using airtel since last 4 years and I was quite unhappy with their services. there were times where they took my 300 advance and never activated my postpaid for airtel. but as I have heard that all telecom companies have the same attitude, I decided to continue with airtel, with the launch of 4g I have upgraded it as I have a 4g device. with my plan 399 is really fantastic to use airtel, my prepaid bills have been really reduced and I could able to save atleast 30% on what I used to spend previously on prepaid. at lowest 4g device is available at 6k and I would totally recommend to use airtel postpaid rather than overrated prepaid:-)