iPhone 15 Pro to Feature 'Action' Button for Powering Off/Force Restarting

The iPhone 15 Pro and iPhone 15 Pro Max will introduce a new button press combination to power off and force restart the devices.
The mute switch is expected to be replaced with an “Action” button, which will take on the role of the volume buttons when powering off/resetting the iPhones.
The “Action” button may also be used to take photos in the Camera app, with force-sensitivity enabling a light press to auto-focus the camera, a hard press to take a picture, and a hard/long press to record video.
Apple is said to be opting to not use solid-state buttons on the iPhone 15 Pro models.
Check out our dedicated article and forum post for more information on the iPhone 15 Pro and Pro Max.