Select the network your phone is locked NOT the network you want to use
1. - Turn on the handset with a SIM card not accepted by the device (your new network operator)
2. - If the card has a PIN number, enter it and press OK.
3. - The device will prompt: SIM Network unlock PIN, Now enter the code and press OK.
4. - Your phone will indicate: "The operation was successful", becoming permanently unlocked.