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When call waiting is turned on, you can answer a new call without ending your ongoing call.
1. Find "Additional settings"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Additional settings.
2. Turn call waiting on or off
Press the field next to "Call waiting" to turn the function on or off.
3. Return to the home screen
Press the Home key to return to the home screen.