M5350 
3G Mobile Wi-Fi User Guide 
Figure 4-17 PIN Configuration - PUK Decode
A PUK (PIN Unlocked Key), also known as Personal Unlock Code (PUC), is used in 3GPP mobile phones to reset a personal identification number (PIN) that has been lost or forgotten. The PUK is a SIM-specific code assigned by the service provider. If a user does not know his or her PUK and is prompted for it, it should be obtained from the service provider.
On the page as shown in Figure 4-17,first enter the PUK code and then set a new PIN code to unlock your SIM card as well as any device with it inserted.
4.4.1.5. Auto-unlock PIN
Figure 4-18 PIN Code Auto unlock
