It is advisable to avoid using your BSNL mobile balance for accessing internet via 3g datacards .Instead use monthly Data RCV.I lost(used) Rs 3 in 2 minutes as it is quite costly if the the mobile balance is used for accessing internet via 3g datacard.Wonder when BSNL will start BSNL 3G data recharge online.However,prepaid mobile recharge(2g and 3g)is working on the BSNL website.