You don't know the numbers of BSNL FnF where you have already registered?
How to know Friends and Family ( BSNL FnF ) numbers already registered by sending SMS to 53733.
To know the previous registered BSNL FnF numbers just type and Dial as follows:
Then instantly your previously registered BSNL FnF numbers will be displayed in your mobile.
This is applicable to all your BSNL plans.