1. Find "Supplementary services"
Press the phone icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-cb77762e-fe16-40a2-8291-1e4764721890.png?width=198&height=440)
Press the menu icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-3acbab7b-fbfa-4c3e-91a4-e55c30567443.png?width=198&height=440)
Press Settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-c574e8cc-d305-49dd-9639-80ade2e398f9.png?width=198&height=440)
Press Supplementary services.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-9a6e00a1-d7ae-4f93-a2fe-299999cf8674.png?width=198&height=440)
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-951e5018-3ac3-4362-a2a3-ffe99ad20ff1.png?width=198&height=440)
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-951e5018-3ac3-4362-a2a3-ffe99ad20ff1.png?width=198&height=440)