Check BSNL 2g and 3g data plan

I read many posts by many people giving of different numbers to check my usage, but nothing worked me either it says wrong number or it says recharge not possible
i finally found a way to check for 2g data usage..,
send a message as
DATA2G to 53733
or
for 3g type as
DATA3G to 53733
it worked 100% in Tamilnadu checked