I always wondered just why people bother with a wired cellphone headset. You've seen them: one hand to hold the phone, one hand to cram the earpiece into their waxy canal and then the other hand to hold the microphone somewhere near the mouth. And all the while evil radiation goblins are racing up the wire, directly into the brain. Hands free? No way.
The handphone takes this madness a step further. Why have one simple, easy to use unit which can simply be held to the head when you can strap a mess of wires onto the back of your hand? Take a look at the picture. How would you dial it? And how would you do anything else while wearing it? Even the fixings are odd. Instead of a simple velcro strap (which seems good enough for both the microphone and speaker) you have two elastic straps. One to cut off the blood flow to your middle finger and one to do the same for your wrist.
The handphone is, of course, a concept design. And will remain so, forever.