Your router is carrier-locked. It will only accept SIMs from the original network (e.g., Telstra in Australia, EE in the UK, or Vodafone in Germany). To free it, you need an —a unique 8–16 digit number tied to your router’s IMEI.
Press or Apply .
You’ve just bought a second-hand Huawei B818-263 —a sleek, powerful white tower of internet potential. But when you insert your shiny new SIM card from a different network, the router’s screen glows red, and the admin panel shows a single, dreadful word: "Invalid SIM" or "SIM Locked." how to unlock huawei b818-263