Samsung Galaxy A12
Android 10.0
Select help topic
1. Find "SIM card manager"
Slide two fingers downwards starting from the top of the screen.
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Press the settings icon.
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Press Connections.
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Press SIM card manager.
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2. Turn use of SIM on or off
Press the required SIM.
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Press the indicator to turn use of the SIM on or off.
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Press the Return key.
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3. Select default SIM for voice calls
Press Calls.
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Press the required setting.
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4. Select default SIM for text messaging
Press Text messages.
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Press the required SIM.
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5. Select default SIM for mobile data
Press Mobile data.
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Press the required setting.
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6. Return to the home screen
Press the Home key to return to the home screen.
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