Oh conceptual design, how awesome thou art. This is the "Second Life Mobile Phone Concept" by Cho Sinhyung & Jeon Jungjae, a phone that employs both a lovely AMOLED screen in glorious full color when it's active, and an E-Ink display when it sits in standby mode. Juice saver deluxe! Furthermore, the degree of transparency in the screen shows the percentage of battery remaining. Fade away like you're Marty McFly. Futuristic.
Forever running out of power? Everyone is, even if you plug your phone in every chance you get. While this concept is based around the life of the battery, take a peek at the excellence in the aesthetics as well. Seems like it'd have more than a couple fingerprints on it on the daily, and maybe it's breakable, but heck if it doesn't look spectacular.
[Via Yanko Design]