A mobile phone that can hang around

Check out this mobile phone concept by Alec Wong & Donn Koh. It has a very unusual and special design. It looks like those "do not disturb signs" that you hang outside your door at hotels. It also features a very basic, minimal and simple design. It has 12 keys (like your usual phone keypad) , a large round button/knob at the bottom and a LED near the top. Interesting...