By default, the Samsung device sends messages (SMS) via SIM card 1, but you can also select SIM card 2 in the SIM card management settings.

Note: The default SIM card for SMS can also be changed via the status bar.

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:  Tap on  Text messages
Step 5:  Choose between  SIM 1  and  SIM 2
  1. Open the Settings
  2. Tap on Connections
  3. Tap on SIM card manager
  4. Tap on Text messages
  5. Choose between SIM 1 and SIM 2

Samsung Instructions
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