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Samsung Galaxy A12
Android 10.0
1. Find "Supplementary services"
Press the phone icon.
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Press the menu icon.
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Press Settings.
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Press Supplementary services.
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2. Turn call waiting on or off
Press the indicator next to "Call waiting" below the required SIM to turn the function on or off.
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3. Return to the home screen
Press the Home key to return to the home screen.
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