Now, look at your phone. Then move your head to the left.
And, like genuine magic, your phone will return to the home screen.
And once you've recovered from the shock, watch that blue rectangle move around the home screen. Wait until it's hovering over the set of icons featuring the one you want to click - then move your head right.
Then wait until it's on the exact icon you want - and move your head right again.
Incredible. Now click away to your heart - or your head's - content, waiting for the blue rectangle or square to hover over the link you want to choose.
Any problems? Make sure the Auto Scanning option in the Switch Control menu is on:
And you can always change the commands that your head-moving makes: you can use it to activate Siri, increase and decrease volume and much more.
(Don't worry - you can still tap your phone like normal, and simply head back to Switch Control to turn it off at any time. But why would you ever want to?)