If you are not sure, click on the services below before requesting an unlocking code:
If you have WiFI connection:
1. Connect your iPhone to the Internet via a WiFi network.
2. Insert a SIM card from a network carrier different from the one the iPhone is locked to and turn on the phone. If the card has a PIN, type it in.
3. The iPhone will connect to the Apple server, check for the unlocking and automatically apply it to the phone in seconds.
If you don't have WiFI connection:
1. Insert a SIM card from a network provider different from the one the iPhone is locked to and turn on the phone. If the card has a PIN, type it in.
2. You will see that your iPhone has no service.
3. Open iTunes on your computer and connect your iPhone via USB cable.
4. iTunes will connect to the Apple server, check for the unlocking and automatically apply it to your iPhone in seconds.
Disconnect and restart the device. Your iPhone is now permanently unlocked!