Some versions of the B311-221 can be unlocked by "debranding"—installing a generic Huawei firmware that isn't tied to any carrier.
Unlocking the router allows you to use it with any carrier's SIM card, bypassing the original network restriction. The most common and reliable method is IMEI-based unlocking , which involves obtaining a unique network unlock code (NCK) and entering it through the device's web management page. Step 1: Obtain the IMEI Number Unlock Huawei B311-221