I think PM should have more info on the PUK, what it is, what actions may trigger the accidental locking of Sim, and the process of PUK, how long it takes to receive.
Apersonal unblocking code(PUC), also known as aPersonal Unlocking Key(PUK), is used in3GPPmobile phones to reset apersonal identification number(PIN) that has been lost or forgotten.
Most mobile telephones offer the feature of PIN protection. After switching on the phone, if the PIN security function is active, the user is requested to enter a 4-8 digit PIN enabling the phone's non-emergency calling functions. If the wrong PIN is typed in more than three times, either the SIM card, the device, or both become locked. They can be returned to their original unlocked state by entering a PUC, provided by the service operator after verification. If the wrong PUC is entered ten times in a row, the device will become permanently blocked and unrecoverable, requiring a new SIM card. Cellular phone users are therefore advised by most providers to keep their PUC written down in a safe place separate from the device.
The PUC (PUK) is a SIM-specific code assigned and provided by the service provider.
If anyone has a better way to explain, or IF PM could draft a better way to explain this, and put in Knowledge base, that would serve a purpose
