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.

your phone prompts you to enter a Personal Unlock Key (PUK), an eight-digit number. This number is located on the packaging your SIM card came in. If you don't have the box, contact your carrier ...

The good thing is that retrieving your Safaricom PUK (PIN Unlocking Key) and regaining access to your SIM card is easy. Have you ever grabbed your phone only to find it locked because you forgot ...