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When call waiting is turned on, you can answer a new call without ending your ongoing call.
1. Find "Addititional settings"
Press the phone icon.
Press the menu icon.
Press Call settings.
Press the name of the SIM.
Press Addititional settings.
2. Turn call waiting on or off
Press the indicator 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.