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NCK
Abbreviation of Network Control Key. The NCK is a 15-digit key required to "legitimately" unlock the iPhone 2G. The mechanism to unlock the phone with a valid NCK is still present and usable in X-Gold 608 and presumably later basebands. It is, however, superseded by the policies set in the WildcardTicket that is generated during the activation process. An unlocked phone receives a wildcard ticket that has no restrictions set.