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The phone locks up and says Enter PUK, what is this, how do I find
Cindi Gerst you need to contact your provider. For example if your provider is T-Mobile you" Contact Customer Care to request your PUK code. When the device displays “SIM card is PUK-Locked. Please contact Customer Care,” tap Emergency Call. At the Enter PUK screen, enter the code provided by the Customer Care representative. Tap OK. Enter a new PIN. Tap OK. Confirm the new PIN. Tap OK." this should be a similar process with all other providers. As for yuor question about what it is " A PUK or ‘Personal Unlocking Key’ is a security feature on most mobile devices that protects your SIM card data. A PUK code is required when a SIM Card PIN code has been entered incorrectly." from
Personal unlocking key contact customer care
