For Air tel gprs settings in blackberry handset follow the steps

1. Then select options.
2. Then select advanced options.
3. Then select TCP.
4. Then you will find APN and in APN you need enter airtelgprs.com(Type airtelgprs.com everything in small letters,without leaving any space in between) ,and leave username and password blank.
5. After doing the settings press the menu key and press save.
6. After doing the settings you also need to activ the gprs services from the service provider to use the gprs service.

The string for use with Airtel India is +cgdcont=1,"IP","airtelgprs.com",0,0

After this just dial and enjoy the network on your computer. Speeds are decent in the range of 60

1. Press the menu key

-100 kilobits per second wherever EDGE is available. Its available in most metros