Samsung How to Set default SIM card for Text messages
Samsung 264By 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)





- Open the Settings
- Tap on Connections
- Tap on SIM card manager
- Tap on Text messages
- Choose between SIM 1 and SIM 2