Unlocking the Huawei B311-221 gives you total control over your hardware, but it isn't a plug-and-play process like unlocking a smartphone. Because the web interface often hides the unlock prompt, flashing generic firmware is frequently the only solution.
Contact your original carrier (they may provide it for free if your contract is over). Use professional services like DC-Unlocker or GSM-Unlock. B311-221 Unlock Firmware
: Some community tools, like the B311-221 Chrome Extension , provide a developer interface to help manage or potentially bypass certain UI restrictions. Step-by-Step Unlock Procedure (Code Method) Unlocking the Huawei B311-221 gives you total control
: Once completed, perform a Factory Reset to clear old carrier settings. Verifying the Update like the B311-221 Chrome Extension
Technical Analysis of Firmware Unlocking for the Huawei B311-221