This would be a challenge in rain-logged New Jersey: Apparently the first solar-charging mobile phone is on sale in Japan. This blog from Fast Company has some details about the device, which is from Sharp. Their take, not such a great product. I must admit, if I was beholden to solar power for my mobile over the past month in New Jersey, I wouldn't be doing a whole lot of talking on the run. In any case, just an idea of what might be coming our way in six to nine months. Samsung and LG are also working on this design challenge.