: Once the "SIMLOCK" is removed via an unlock code, the router supports any standard Mini-SIM from carriers worldwide across FDD and TDD bands (B1/B3/B7/B8/B20/B38).
While many sites offer paid services, you can attempt these free avenues: huawei router b311221 unlock firmware free
: This involves installing a modified or "general" firmware version that has SIM restrictions removed. Title: The Quest for Connectivity: Analyzing the Risks
IPv4v6.