Dial `*222#` from your BSNL SIM
Dial `*888#` from your BSNL SIM
Dial `*1#` from your BSNL SIM
Call BSNL customer care at `1503`
Check your number in the phone’s SIM settings
Call or send a message to another phone and see your number on the recipient’s device
Check the SIM card pack or activation documents for the number