Control Your iPhone With Your Head

To control your iPhone with your head do the following.

Step 1 : Go to Settings -> General -> Accessibility

Step 2 : Turn On Switch Control

Step 3 : Select Switches and Add new Switch

Step 4 : Select Camera and pick head movement and set the action.

Center your face with the camera until the two blues bars are centered. You can use it to trigger Volume, Siri, App Switcher, Notification Center