If you are using the Huawei device with two SIM cards, you can set if both SIM cards should use 4G.

Android 10 | EMUI 10.0
Step 1:  Open the  settings
Step 2:  Tap on  Mobile network
Step 3:  Tap on  SIM management
Step 4:  Activate or deactivate  Dual SIM 4G
  1. Open the settings
  2. Tap on Mobile network
  3. Tap on SIM management
  4. Activate or deactivate Dual SIM 4G

Huawei Instructions
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