The PUC code or PUK key is found on the SIM certificate, which you get when you first connect to a wireless network. Entering the PUK number will bring back the original unlocked status of your cellular phone. The PUK can also be obtained from the network service operator (ie. AT&T, Vodafone, Rogers, Movistar, T-Mobile, etc.) after following the appropriate security measures. This number is unique to the SIM card issued by your provider and has a reasonable level of security against random fraud." http://unlockworldwide.com/2011/10/what-is-puk/
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