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If you purchased your B311221 from a carrier like Vodafone, T-Mobile, O2, Telstra, or Jio, you have likely discovered that your device is "crippled." You cannot use a SIM card from a different provider, advanced settings are hidden, and sometimes, the signal reception is artificially degraded.

However,

Leave a comment below or join the r/HuaweiRouter B311221 unlock thread.