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
Confirm SIM card for calls -  Open the  Settings
Confirm SIM card for calls -  Tap on  Connections
Confirm SIM card for calls -  Tap on  SIM card manager
Confirm SIM card for calls -  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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