Discovered by an anonymous tipster, the feature allows users to control their devices with left-or-right head movements and was first reported by 9to5Mac. Tilting the head in one direction would launch the Siri personal assistant, for example, while tilting it in the opposite direction could return the screen to the home menu.
The features were discovered within the software's Accessibility Settings, suggesting that Apple is looking at ways to make using its devices easier for people who have limited limb movement or other physical disabilities. Or it could simply be a backup option for when traveling on public transport and not having a hand free to operate the phone or tablet for fear of falling over.