![Samsung Galaxy S21 Ultra 5G](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ee679143-c863-46d6-9a64-f2457162c911.png?width=150&height=320)
Samsung Galaxy S21 Ultra 5G
Android 11.0
1. Find "SIM card manager"
Slide two fingers downwards starting from the top of the screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-b046ae34-0c83-43a5-a7fe-d4a9539ce1cc.png?width=210&height=466)
Press the settings icon.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-3ac35714-e62f-4d66-837a-4ea3e6c9326f.png?width=210&height=466)
Press Connections.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-8b8c163e-b3c2-49f0-ae42-f33f8069b5c2.png?width=210&height=466)
Press SIM card manager.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-bdf734f9-504a-47e0-abfa-a8d45e93ca15.png?width=210&height=466)
2. Turn use of SIM on or off
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ecec25fd-890f-46c6-8200-cce616367e7c.png?width=210&height=466)
Press the indicator to turn use of the SIM on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-8913fb2a-ed8b-4a90-b456-2b9144d3ae17.png?width=210&height=466)
Press the Return key.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-8913fb2a-ed8b-4a90-b456-2b9144d3ae17.png?width=210&height=466)
3. Select default SIM for voice calls
Press Calls.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ecec25fd-890f-46c6-8200-cce616367e7c.png?width=210&height=466)
Press the required setting.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-1f3942aa-dd70-409c-a9a5-c6708bb662c3.png?width=210&height=466)
4. Select default SIM for text messaging
Press Messages.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ecec25fd-890f-46c6-8200-cce616367e7c.png?width=210&height=466)
Press the required SIM.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-8f72d8f6-98b3-490a-aab3-82394e665133.png?width=210&height=466)
5. Select default SIM for mobile data
Press Mobile data.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ecec25fd-890f-46c6-8200-cce616367e7c.png?width=210&height=466)
Press the required setting.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-1f4379fe-89c7-4ace-ba52-5ab4cd548e26.png?width=210&height=466)
6. Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-ecec25fd-890f-46c6-8200-cce616367e7c.png?width=210&height=466)