What is PUK code :PUK is the abbreviation of PIN unlocking key. It is an unique code consists of 6 to 10 digits which will be created for each mobile SIM card by the network provider itself.
Why does my SIM card has PUK code :As mentioned above, every mobile network provider set a PUK code and PIN code for a SIM card . The only reason for setting these codes is ensuring security to their customers. SIM number is different from PUK number. To know your SIM number.
My PUK code is Locked , How can I unlock PUK and use my SIM :If you enter your PIN code incorrectly for three times, the PIN code will be locked and your phone will ask PUK code.
At this time you have to be very careful and should contact your network provider through online or other landline, mobile phone to get the PUK code. But if you assume or incorrectly enter your PUK then your SIM will be deactivated and you have to buy new SIM card.
How to get and unlock PUK code for my SIM/Phone :You can retrieve your PUK code from your networks provider's official account management webpage or from their helpline.
Philippines : Smart Infinity
Belgium : Proximus
Singapore : SingTel *M1-MobileOne * StarHub
USA:AT&T*C Spire Wireless | SouthernLINC| Cincinnati Bell Wireless | Alaska Wireless | Verizon