The BSNL data checking code mayn’t be same for all states.So you may get error like
Wrong Number or Recharge Not Possible.Here is the way to check the BSNL 2G GPRS, 3Gdata usage:
For Tamilnadu BSNL users BSNL 2G Prepiad customers may send an SMS to know the balance free data usage Type DATA2G to 53733 .
Tamilnadu TN BSNL 3G prepaid users can check their data usage by sending an SMS as DATA3G to 53733 .
FOR UP User Dial *123*6#
For Kolkata BSNL Users Dial *123*10# to know free3G and 2G data usage if the customer belongs to Kolkata.Tested in Bihar
and Jharkhand... For West Zone BSNL Users BSNL customers from WestZone of India can get the Data usage by simply dialing
*112#. Tested and checked in Gujarat and Maharashtra. For Kerala BSNL Subscribers Kerala customers can dial *124*1# to know about the remaining data balance on your account.