Check BSNL 2G&3G data balance

I read many posts by many people giving me different
numbers to check my
usage. but nothing

workded for me. either it
says wrong numbber or it says recharge not possible

i finally found a way to
check for 2g data usage....
Here it Comes By Sending sms with the
content
DATA2G
to 53733
clearly worked for me in
tamilnadu circle.... Check In Your states For 3G users send as
follows DATA3G to 53733 I dont Checked It, check and reply