On this site, getting your modem’s unlock code is as simple as entering your modem’s IMEI, enter the CAPTCHA code and click on the “ Calculator” button. If you rather go for something that can unlock your Huawei modem within seconds for free instead, check out the following three unlock code generators.
Some forums do offer such service for free—but you would have to wait for the kind soul to respond to your request, and God knows how long they will take. Most of the time however, these unlocking service comes with a small fee. It’s not difficult to look for unlocking service for Huawei USB 3G modem online. Apby Vincent How to Unlock Huawei USB Modem For Free