Airtel 3g not working on nokia lumia 800

I've bought a new Nokia Lumia 800 and inserted my old airtel 3g sim card in it. Everything is fine except using internet. Please help to resolve this problem.

Thanks.
H.Anand

Airtel 3G is a good choice. Follow these steps, go to Sim Service-->My GPRS-->Select Get 3G Settings.

You may also dial 121 to get help from Airtel.

Why don't you use 121 to get help from airtel? They'll fix all your problems regarding any network or service interruption.

I'm also using Nokia Lumia 800. It's an awesome experience.

You know what AIRTEL CUSTOMER CARE STINKS. They dont speak english. If they cant solve your problem they ll just hang up.