If you own a (a popular 4G/LTE Cat7 router), you might have purchased it from a specific network provider like Three UK, EE, O2, or Vodafone . These routers are often SIM-locked , meaning they reject SIM cards from other networks with an error message: "Invalid SIM Card" or "SIM Lock Restriction."
Many people confuse the -932 with other variants. Look at the sticker on the back of your router. how to unlock huawei b535-932