1. Find "Mobile networks"
Press Settings.
![](http://wmstatic.global.ssl.fastly.net/ml/7250324-f-aeb8eeab-2073-4ed0-bea5-4b04cfd94680.png?width=208&height=462)
Press Mobile networks.
![](http://wmstatic.global.ssl.fastly.net/ml/7250324-f-5124f715-e113-48eb-a1f5-4ca10ae89a91.png?width=208&height=462)
2. Turn use of SIM on or off
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7250324-f-dc14d2d5-150c-4d8a-bfb9-739c551a998d.png?width=208&height=462)
Press the indicator next to "Turn on" to turn use of the SIM on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7250324-f-f91d6771-28db-468f-998b-262f9d41033a.png?width=208&height=462)
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/7250324-f-e1f58a73-e33e-4931-8a8b-6d21669a2a8e.png?width=208&height=462)
Press the Return key.
![](http://wmstatic.global.ssl.fastly.net/ml/7250324-f-f91d6771-28db-468f-998b-262f9d41033a.png?width=208&height=462)
3. Select default SIM for voice calls
Press the required setting below "Default for calls".
![](http://wmstatic.global.ssl.fastly.net/ml/7250324-f-dc14d2d5-150c-4d8a-bfb9-739c551a998d.png?width=208&height=462)
4. Select default SIM for mobile data
Press the required SIM below "Data SIM".
![](http://wmstatic.global.ssl.fastly.net/ml/7250324-f-dc14d2d5-150c-4d8a-bfb9-739c551a998d.png?width=208&height=462)
5. Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7250324-f-dc14d2d5-150c-4d8a-bfb9-739c551a998d.png?width=208&height=462)