Airtel Chennai is providing a good service, but the only thing is they tell they are providing free roaming to southern state (Here in Chennai). But they provide only in areas where they have these own base station. <p>
But based on service they are really ahead of all southern service providers. Coverage is really excellent; you can get it even inside a congested apartment area. HUTCH has just reached and the rates are really higher compared to Airtel. <p>
Airtel has promised that they will introduce the offers to all, which is being enjoyed by Mumbai customer. Since they are there in 16 states already, I personally feel they will come without cheaper tariffs in the future, mainly with Airtel to Airtel customer. <p>
I recommend my friend to go AIRTEL