what is a puk code

A PUK (Personal Unlocking Key) code is a unique sequence of 8 digits that is used to unlock a SIM card. It is required when a SIM PIN security code has been entered incorrectly multiple times, causing the SIM to lock. The PUK code is provided by the network and can be found in the device's settings or by contacting the mobile service provider. If the PUK code is entered incorrectly multiple times, the SIM will become permanently blocked, and a new SIM will be required