One of the novel features of the latest Apple flagship, the iPhone 6s, is 3D Touch. It brings up contextual options when you press down rather than tap on an icon or in an app interface. It’s an elegant way to let you access additional functionality without cluttering up the UI.
Sadly, it’s only available on that iOS device… for now. A research team at the University of Michigan have developed a way to add this feature to any smartphone using components that are already in your mobile device: the mic and speaker.