If this function is activated on your Huawei smartphone, the data connection will be changed to the other SIM  in case of a VoLTE (Voice over LTE) call. This is so you can still surf while calling.

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  Switch data connection during calls
  1. Open the settings
  2. Tap on Mobile network
  3. Tap on SIM management
  4. Activate or deactivate Switch data connection during calls

Huawei Instructions
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