Like the title says, you can forward calls from one SIM card to the other SIM card on your Huawei device, if one of the two is not available or defective.

Android 10 (EMUI 10.0)
Step 1:  Open the  settings
Step 2:  Tap on  Mobile network
Step 3:  Tap on  SIM management
Step 4:  Tap on  Call forwarding between SIMs
Step 5:  Activate the  option  you want
  1. Open the settings
  2. Tap on Mobile network
  3. Tap on SIM management
  4. Tap on Call forwarding between SIMs
  5. Activate the option you want

Huawei Instructions
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