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- NCK - "Network Control Key" or “SIM network unlock PIN”
A sim network lock is a technical restriction built into GSM mobile phones by mobile phone manufacturers for use by services providers to restrict the use of these phones to specific countries and/or networks.
A Sim Network Unlock Pin will remove all locks from a phone and is referred to as the master code, network code key, or multilock code. There can also be multiple levels of locks placed on the phone by networks, which block the use of other networks' SIM cards. These are usually referred to as "Network" (NCK) or "Service Provider" (SPCK) locks and can be removed using the corresponding unlock codes, which are unique to each phone depending on its IMEI.

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