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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.
UPC (Universal Product Code) is a numeric symbology used in retail applications. UPC has two variations, an 11 digit UPC Type A barcode and and 6 digit UPC Type E barcode.A check digit is automatically calculated by the barcode generation software in both UPC variations.PC Type E (UPC-E). UPC-E is a smaller seven digit UPC symbology for number system 0. It is often used for small retail items. For UPC-E barcodes, you normally specify 6 digits and let your barcode printing software calculate the seventh check digit for you.