In addition to the standard SIM card for calls, we can also activate a function before each call, so we can choose which SIM card to use for each outgoing call.

Android 10 | One UI 2.0
Step 1:  Open the  Settings
Step 2:  Tap on  Connections
Step 3:  Tap on  SIM card manager
Step 4:  Enable or disable  Confirm SIM card for calls
  1. Open the Settings
  2. Tap on Connections
  3. Tap on SIM card manager
  4. Enable or disable Confirm SIM card for calls

Samsung Instructions
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