Speaking as a guy who rarely goes outside, this concept would be very much the same as a regular phone, but it is a neat looking flexible device that doubles as a watch when not in use.
It's by Seungkyun Woo & Junyi Heo, and wraps around your arm in the normal state, soaking up solar power to keep it going longer. It's kind of a genius idea to stick solar onto everything in the future, or even a combination of solar and kinetic charging. [Yanko Design]