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When call waiting is turned on, you can answer a new call without ending your ongoing call.
1. Find "Call waiting"
Press the phone icon.
Press the menu icon.
Press Call waiting.
2. Turn call waiting on or off
Press the required SIM.
Press the indicator next to "Call waiting" to turn the function on or off.
If you turn on the function, press Open.
3. Return to the home screen
Press the Home key to return to the home screen.