Learn how to turn your device off and back on again. Restarting your device is often the first step when troubleshooting a device issue.
Note: If you're having problems with your device (e.g., an app is frozen, the screen isn't responding, etc.), the first step in troubleshooting is to turn your phone off and on again (also known as a soft reset).
To restart iPhone, quickly press and release the Volume up button.
Note: You should only use this feature when iPhone isn't working correctly.
Quickly press and release the Volume down button.
Press and hold the Side button until you see the Apple logo.