DoCoMo is working on the Solar Hybrid phone, a “solar-powered” phone that is also rugged enough to be “waterproof”, according to DoCoMo. It comes with an 8 Megapixel camera too, so this one is made for outdoor shooting.
It’s not entirely “solar-powered” as it can’t run on solar power alone. It’s more of a “solar assisted” device. 10 minutes in direct sunlight will give you a whopping 1 minute of talk time. Oh and “waterproof” means that the phone can stay in water for 30mn and no deeper than 1 meter.