A PUK code is required if a GSM SIM card was locked after entering the wrong PIN code three times in a row. Entering a wrong PUK code ten times in a row disables the SIM card permanently.

A SIM card lock, however, prevents the scammer from gaining ... your phone prompts you to enter a Personal Unlock Key (PUK), an eight-digit number. This number is located on the packaging your ...

(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card. SIM locks are used to ensure subscribers ...

Safaricom why a SIM card can be locked or deactivated and how to unlock it. The company noted that the line could be locked as a result of an activity, you can ask for PUK to unlock and access the ...