Daisung says, “I’ve uploaded some photos of my analogue phone + old Nokia phone. I’m currently overseas so I’ve had to leave it behind, but every time I’ve used it, I got great reactions out of people who were extremely curious. The handset works just like a regular phone by the way!” Link.
Update 9/1: If the link above still is overloaded, check out another version complete with DIY instructions by Jake von Slatt. – Link.