How to unlock Huawei E3131 (T-Mobile UK) 3G Modem?
1. Download the T-Mobile UK E3131 Huawei modem unlocking software from the link which is provided at the end of the article.
2. Disconnect the internet if already connected.
3. Eject the data card from the computer.
4. Change the default sim with any other network provider sim (other than T-Mobile network SIM).
5. Now, connect the modem to PC or laptop.
6. Let it launch the default software of the modem.
7. Close the software of modem (Huawei Mobile Partner software of T-Mobile brand).
8. Run the downloaded T-Mobile UK E3131 3G Huawei modem unlocker software.
9. Detect your Huawei E3131 (T-Mobile UK) modem into the unlocking tool.
10. Once it will show the IMEI of the device, input the correct 8-digit NCK / unlock code in “Unlock Code (6-8 digits):” box and click on OK button.
11. Now your modem is unlocked forever.
Note : Don’t use any free / wrong codes into T-Mobile UK Huawei E3131 3G data card, otherwise it will be locked permanently. It comes with Huawei new algorithm security and older codes will not work, which was build with old algorithm security. If you will try with wrong codes then your modem will be locked permanently. Pay 2.38 USD through Paypal button and mention model with IMEI in the transaction.