1. Find "SIM cards & mobile networks"
Press Settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7090424-f-69cd5224-b63e-4533-ab51-976890122e78.png?width=206&height=456)
Press SIM cards & mobile networks.
![](http://wmstatic.global.ssl.fastly.net/ml/7090424-f-0c34c0a5-e412-4b55-b7f1-79e7a232ee03.png?width=206&height=456)
2. Turn use of SIM on or off
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7090424-f-cd965eb0-b7d0-4ae2-8e81-cb795dd63834.png?width=206&height=456)
Press the indicator next to "Turn on" to turn use of the SIM on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7090424-f-e101ef64-67d6-44b8-810e-6b3c16596dd4.png?width=206&height=456)
If you turn off use of the SIM, 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/7090424-f-311e7958-ab3c-4973-a60d-4a997f8b4bbd.png?width=206&height=456)
Press the Return key.
![](http://wmstatic.global.ssl.fastly.net/ml/7090424-f-e101ef64-67d6-44b8-810e-6b3c16596dd4.png?width=206&height=456)
3. Select default SIM for voice calls
Press the required setting below "Default for calls".
![](http://wmstatic.global.ssl.fastly.net/ml/7090424-f-cd965eb0-b7d0-4ae2-8e81-cb795dd63834.png?width=206&height=456)
4. Select default SIM for mobile data
Press the required SIM below "Data SIM".
![](http://wmstatic.global.ssl.fastly.net/ml/7090424-f-cd965eb0-b7d0-4ae2-8e81-cb795dd63834.png?width=206&height=456)
5. Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7090424-f-cd965eb0-b7d0-4ae2-8e81-cb795dd63834.png?width=206&height=456)