A SIM network unlock PIN (NUP) is an 8 or 16 digit code used to remove the carrier lock from a mobile phone. This lock prevents the phone from being used on other carrier networks.

The lock is a PIN, which must be entered each time the phone is turned on, even if the SIM is moved to a different phone. This extra layer of security prevents someone from using your SIM on any ...

If you have a SIM card PIN enabled on your phone to access data on the SIM card, but you repeatedly enter it incorrectly, the SIM card may lock you out from further attempts. You can reset the SIM ...

[Jason Gin] wanted to reuse the SIM card that came with a ZTE WF721 wireless terminal he got from AT&T, but as he expected, it was locked to the device. Unfortunately, the terminal has no func… ...

The PIN (Personal Identification Number) enables secure SIM card and network access. It is provided with your SIM card. If the PIN code is entered wrongly three times, the phone is locked and requires ...

The SIM card also has an associated PIN Unlock Key (PUK). If you attempt to do a SIM PIN Lock, and you fail to guess the original PIN, the SIM will be locked with the PUK.

Following successful entry, you enter a new PIN code for that SIM card and the phone will unlock to your homescreen with full access. Advertisement - scroll for more content ...

A SIM network unlock PIN (NUP) is an 8 or 16 digit code used to remove the carrier lock from a mobile phone. This lock prevents the phone from being used on other carrier networks.