I love Airtel, I am using only Airtel from my first mobile usage. The coverage in my area never go worse and I did not face any bitter experience with Airtel. I have changed mobile number but did not changed my network yet. Yes, I agree with the Tariff hikes during somedays but it provides best at that time also Ad-ons are good with the rate. My entire family are using Airtel as of now and we never move to other network.
Airtel Introduced 4G first, In the beginning I faced coverage problem but not its working ultimate. The customer service is very responsible and I used to inquire over the website through E-mail.
Thank you Airtel.