Free airtel gprs for s30,s40,sony ericsson,motorola,other phones-first alter ur accesspoint to airtelmms.com,sony(airtelfun.com).then change ip to 100.1.200.211.after that change home page to http://raj4u.wen9.org.then restart ur phone.Try to connect 15 to 20 times.if failed clear cache,off phone remove the sim and reinsert.Then power on and surf net.I am not sure it work in all states.
Good luck :)