Device Guides
Samsung Galaxy S21 Ultra 5G
How to
Choose dual SIM settings
When you insert two SIMs into your mobile phone, you can make calls and send and receive messages from both SIMs. You can also select a default SIM for mobile data usage.
List view
Find "SIM card manager"
Slide two fingers downwards starting from the top the screen.
Tap the settings icon.
Tap Connections.
Tap SIM card manager.
Turn use of SIM on or off
Tap the required SIM.
Tap the indicator to turn use of the SIM on or off.
Tap the Return key.
Select default SIM for voice calls
Tap Calls.
Tap the required setting.
Select default SIM for SMS
Tap Messages.
Tap the required SIM.
Select default SIM for mobile data
Tap Mobile data.
Tap the required setting.
Return to the home screen
Tap the Home key to return to the home screen.
Slide two fingers downwards starting from the top the screen.
Tap the settings icon.
Tap Connections.
Tap SIM card manager.
Tap the required SIM.
Tap the indicator to turn use of the SIM on or off.
Tap the Return key.
Tap Calls.
Tap the required setting.
Tap Messages.
Tap the required SIM.
Tap Mobile data.
Tap the required setting.
Tap the Home key to return to the home screen.
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