Nokia have come up with a concept for a new type of phone notification, a special tattoo with magnetic ink that will vibrate when you receive a phone call for example. The vibration will be different each time depending on the notification, and these vibrations are customizable. The tattoos will like like any other normal tattoo, just that this ink (made from ferromagnetic powder) will pick up electromagnetic fields put off by the phone. Nokia have also created something you can stick onto your skin if you are not too interested in having a tattoo. It works just the same way.
Nokia Tele Tattoo Diagram
The Computoguy 