![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 "Mobile networks"
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 Mobile networks.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-bdf734f9-504a-47e0-abfa-a8d45e93ca15.png?width=210&height=466)
2. Turn VoLTE on or off
Press the indicator next to "VoLTE calls ‹SIM›" to turn the function on or off.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-db2acb50-5397-43b6-a28c-b5a244f692a3.png?width=210&height=466)
3. Return to the home screen
Press the Home key to return to the home screen.
![](http://wmstatic.global.ssl.fastly.net/ml/7151223-f-db2acb50-5397-43b6-a28c-b5a244f692a3.png?width=210&height=466)