Convert Bsnl 2g Prepaid sim to 3G sim
1) Send sms M3G120 TO 53733
2) Wait until you get a confirmation sms and follow instructions to send sms M3G120 Y to 53733
3)Wait for some more time – approx 1hr to get another welcome message for 3g. Restart your mobile and you shall see the 3g signals.

