1. Find "SIM cards & mobile networks"
Press Settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-846f314a-ff76-4cdb-83a4-54c089633530.png?width=204&height=446)
Press SIM cards & mobile networks.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-3b5d26d2-1e6d-4848-9e48-8c2bea5a1fa4.png?width=204&height=446)
2. Turn use of SIM on or off
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-645e8e3e-a58d-4a75-ac87-328b311f3520.png?width=204&height=446)
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-d4352ef4-a7a9-4b51-a91c-279c5e34e3bc.png?width=204&height=446)
If you turn off the function, press OK.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-27c6b5bc-c33e-48f0-97be-d4203c07f28d.png?width=204&height=446)
Press the Return key.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-d4352ef4-a7a9-4b51-a91c-279c5e34e3bc.png?width=204&height=446)
3. Select default SIM for voice calls
Press Dial.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-645e8e3e-a58d-4a75-ac87-328b311f3520.png?width=204&height=446)
Press the required setting.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-c45e2141-a898-47d4-a5df-2dbd678b5c80.png?width=204&height=446)
4. Select default SIM for mobile data
Press Internet.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-65296bc9-603e-47fa-bc51-3727bfd146b8.png?width=204&height=446)
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7140723-f-5de7a614-6567-4632-8138-bed5872c910f.png?width=204&height=446)
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-65296bc9-603e-47fa-bc51-3727bfd146b8.png?width=204&height=446)