Not satisfied with just getting its own flavor of slide-to-unlock patented, Nokia wants to take haptic feedback to a level you haven’t previously encountered. Haptic tech is employed, for example, when your phone vibrates as you type on its touchscreen. Haptics deal with appealing to your sense of touch by applying forces or vibrations to your skin.
Which is exactly what Nokia wants to do, proposing the application of tattoos with ferromagnetic inks, that will vibrate based on commands from your phone.