1. Find "Supplementary services"
Press the phone icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-02ec09b6-9af6-40aa-b41f-286113d18907.png?width=204&height=442)
Press the menu icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-e60d65d1-61ce-4297-bdfe-1bc878b831ba.png?width=204&height=442)
Press Settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-f14f40a4-b5e5-4ed1-9f9b-7af605c99258.png?width=204&height=442)
Press Supplementary services.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-2359aafa-4753-4050-9da3-6350039a6b03.png?width=204&height=442)
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.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-ecc363d3-a74b-4c22-8811-2bf0240c899a.png?width=204&height=442)
3. Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-ecc363d3-a74b-4c22-8811-2bf0240c899a.png?width=204&height=442)