Be careful not to confuse SIM unlocking (to change carriers) with Bootloader unlocking (to install custom ROMs). Huawei officially stopped providing bootloader unlock codes in 2018. The Best Way to Unlock Today

While the idea of a "free download" tool is appealing, always ensure you are using a version compatible with your phone's "Algo" type. For older tech, these calculators are a lifesaver; for newer flagship phones, you may need to look toward official carrier requests.

Unlocking Your Huawei Device: A Guide to Unlock Code Calculator Tools

If your contract is finished, most providers are legally required to give you the unlock code for free.