1. Insert a non-accepted simcard into your phone (a simcard that isn’t from the original carrier).
2. Power on phone.
3. Phone will prompt you for the “Sim network unlock PIN”. Type in your unlock code.
4. Your phone is now unlocked.
Here is the second unlocking method.
1. Power on your phone without any simcard inserted
2. Once it finishes booting up, go to your phone’s keypad and dial 2945#*871#
(Replace 871 with your model number, for example: 871 for AT&T, 872 for T-Mobile)
3. If the phone displays a list with “Network lock”, “Service Provider Lock”, “Network Subset Lock”, Corporate Lock”, and “SIM/USIM Lock”, you must select Network Lock.
4. The phone will prompt you for the “SIM network unlock pin”. Enter the unlock code and tap on the “Unlock” button.
5. Device should say: “Network unlock successful”. Your phone is now permanently unlocked