How to use your Network Unlock Code
The Network Unlock Code (NUC), sometimes called a Network Unlock PIN (NUP) or Network Control Key (NCK), allows you to unlock a mobile phone from its original network.
If you've not received a NUC you can request one.
If you need to unlock your phone without an NUC, for example if you forgot your PIN, you can find out how here.
If you already have a NUC, there are different ways to use it depending on your device.