But when I input the unlock code into my phone, it shows "Network unlock request unsuccessful".
I called T-Mobile customer service, and they told I have to turn off the WIFI and try again. I tried that but didn't work. Then the representative said she would escalate my problem to the supervisor.
After I hanged off the call with customer service, I just realized that a couple days again I followed some instructions on the web to try to unlock my Samsung Galaxy Note 2 via a hidden menu.
The instructions look like this: DON'T DO THIS!!!
Put a SIM card from another carrier into the handset and then turn it off and back on.
Go into your dial pad and enter *#197328640#. Go to the main menu > [1] UMTS > [1] Debug Screen > [8] Phone Control > [6] Network Lock > Options [3]Perso SHA256 OFF > then you need to wait for a minute. The go into menus and select back. Now you should see ‘Network Lock’. You should choose [4] NW Lock NV Data INITIALLIZ.
There is also Youtube video that teaching you to do this. But due to my Galaxy Note 2's Android version is already too high to use this hidden menu, I don't have the [4] NW Lock NV Data INITIALLIZ option. So I gave up. But I forget to switch back to Perso SHA256 ON status.I thought I should switch back to Perso SHA256 ON status and try to use my unlock code again. And it did work. I got my T-Mobile Samsung Galaxy Note 2 unlock with the unlock code originally received from the email.
If you played with your hidden menu before trying the unlock code, also try to switch back to Perso SHA256 ON status and try your unlock code again.
