Airtel is the most amazing sim card that I have ever seen. it has a large network coverge .in my family all my members use airtel sim only I have also a airtel sim. and speed of the internet is so fast so what to tell about it and the offers airtel provide is wonderfull. I have use airtel for last 6 yrs so have think of any anthore sim in my whole life. thanku airtel for providing such a wonderfull network in india