1. Find "Supplementary services"
Press the phone icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-f9a27398-50e0-4249-b93b-c0c70a2f7373.png?width=204&height=452)
Press the menu icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-98b59a8c-4e03-410c-858f-214547d0fcf3.png?width=204&height=452)
Press Settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-f410a974-a5ae-4667-b3b3-deaa4787d68b.png?width=204&height=452)
Press Supplementary services.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-af6f662a-a26d-4aca-ae1c-7625dc1433e7.png?width=204&height=452)
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-b29bff34-3c00-4355-b92b-330b3d313d9f.png?width=204&height=452)
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-b29bff34-3c00-4355-b92b-330b3d313d9f.png?width=204&height=452)