Once again, free Airtel GPRS is working.
In NUTSHELL you had to do only 3 things

Enter your cel no. into USER NAME/NO. Field (If it is blank)
Change access point / APN to airtelfun.com or airtelmms.com
Configuring your application for following proxy setting…
- If u r using airtelfun.com
IP Addr : 100.1.200.99
Port no. 8080

- If u r using airtelmms.com
IP Addr : 100.1.201.172
Port No. 8799

That all about settings!