PUK differs for each SIM card on every mobile network, BSNL PUK code consists of eight digits for each mobile SIM card, and it is the only key to unlock the blocked BSNL SIM card through customer care number of BSNL or direct approach at CSC, where activating SIM lock or SIM security in mobile and entering of incorrect Personal Identification Number (PIN) leads to PUK blocked and asks to enter the code to release the SIM.
