1. Find "SIM cards & mobile networks"
Press Settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-18b882b8-ed6f-4486-99e2-d6db67febf57.png?width=198&height=440)
Press SIM cards & mobile networks.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-2f7920e4-ba7c-45ee-915c-cfebb2e5c3dc.png?width=198&height=440)
2. Turn use of SIM on or off
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-f62ae806-e474-42fd-beb0-2ee88cf5ba7f.png?width=198&height=440)
Press the indicator next to "Turn on" to turn use of the SIM on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-7d2537d5-8a53-45e8-9b9c-262e3e12df51.png?width=198&height=440)
If you turn off the function, press OK.
You can only turn off use the SIM if it has not been selected as the default SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-e5f407a4-77e1-472e-b64f-3c4b4f4aae96.png?width=198&height=440)
Press the Return key.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-7d2537d5-8a53-45e8-9b9c-262e3e12df51.png?width=198&height=440)
3. Select default SIM for voice calls
Press the required setting below "Default for calls".
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-f62ae806-e474-42fd-beb0-2ee88cf5ba7f.png?width=198&height=440)
4. Select default SIM for mobile data
Press the required SIM below "Data card".
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-f62ae806-e474-42fd-beb0-2ee88cf5ba7f.png?width=198&height=440)
5. Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-2f62f933-1520-4802-b37c-9063e055ae95.png?width=198&height=440)