While I am not a professional designer who can judge a mobile's design in its true sense but it is a fact that form factor influences the usability of a device very deeply.

Talking about form factor and usability, I wonder what designer Tamer Koseli had in mind while making the Longest Mobile Phone Concept ever.

Just imagine how would you talk to a friend using this phone when the microphone pad is literally touching your chest. There is no MP3 player, no video playback support and not even a camera. The best it can do is recognize text and numbers as your write them on its OLED screen.

As Yanko Design argues, it would be interesting to see the kinds of cases manufacturers would make for this.