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PUK Code. The Personal Unblocking Code (PUK code) is a security feature to protect the SIM card user in case of phone theft. When an unknown user attempts to unlock your phone by putting the wrong PIN code three consecutive times, the card will get blocked.
The UCC is the Uniform Commercial Code, laws that (with variations from state to state) govern commercial transactions in the U.S. A lien is a security interest. UCC lien is a lien that is perfected (explained below) under the UCC. Last year I blogged about security interests and their perfection.