You may have bought a HUAWEI modem from an ISP and decided to change your SIM card to use another network, only to find out that you are been asked to input your unlock key. Here is how to unlock it. Copy this address to your address bar. http://bb5.at/huawei.php?imei=Your Huawei modem I M E I n umb e r ii. Now input your modems IMEI number so it looks like this http:// bb5.at/huawei.php? imei=357133035912053 Copy out the unlock code. When you plug in the modem with your desired Sim card, and you are asked for unlock code, input the unlock code you copied and that’s it.