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NCK
Abreviation of Network Control Key. The NCK is a 15-digit key required to "legitimately" unlock the iPhone 2G. Every other iPhone revision is unlocked with a WildcardTicket which permits every MNC/MCC/ICCID combination. This WildcardTicket is a combination of the NCK key from Apple, which is 5 digits long, your ChipID, 8 digits long, and NorID, 12 digits long.