Here is the trick.. 



step1. Open default brwsr and select the apn which not open any site bsnl internet for karnataka, bsnlmms 4 kerala, bsnlsteam 4 ap. Minimize it 

step2.. Then open any other browser and conect it wt apn which gv tempory prblm eror msg ie. Bsnlwap 4 karnataka, bsnlportal 4 kerala

, and bsnlwap for ap. This apn not conect the site and U get a msg that u used okb. 

step3. So then conect the browser with apn bsnlnet for all states. U get a msg that u usd 0k. After that msg all is free 



Note:- Never disconnect access point BSNL INTERNET, BSNL MMS or BSNL STREAM. - At the time of disconnecting first disconect BSNL NET and after that disconnect BSNL INTERNET, BSNL MMS or BSNL STREAM. - Only 0.01 Rs. will be charged at the time of disconnecting... - In the inbuilt web browser 'web connection time out' pop up will come but don't worry about that. Balance condition : should not be 0 Rs.. Trick will also work in 2g phone but speed will be slow... Enjoy