Follow these steps in turn to find the right solution.
1: SIM lock or NUC (Network Unlock Code) is a lock that locks the phone to a specific operator. If your phone is SIM-locked, only the operator can provide the code to unlock your phone. Contact your operator for help with unlock code for SIM lock or NUC.
2: SIM code is a PIN code consisting of 4 digits, which unlocks your SIM card for use. This code is supplied with your SIM card.
3: PUK (Personal Unblocking Key) code, used to unlock your SIM card if, for example, you have failed to enter your PIN more than three times. This is an 8-digit code that comes with your SIM card. Normally, the PIN and PUK are printed on the plastic card, from where you print out the SIM card when it is new. If you have lost any of these codes, contact your operator.
4: Android PIN is usually used everyday to unlock your phone so you can use it. You choose this code yourself when you activate your phone and your Google account. If you have lost this code, follow this link for detailed help.