At the recent Mobile World Congress, Chinese cell phone manufacturer Umeox Mobile announced their solar powered Android smart phone. The Umeox Apollo comes with a built-in solar panel covering the back of the phone allowing the user to make a call when the batteries are discharged, provided there is sufficient sun available.
If the battery gets completely flat, it will require 17 hours of sunlight to recharge, but normal daily usage needs about 2.5 hours of charging in the sunlight.
The Apollo has a 3.2inch 320 x 480 pixel display, 1 GB of memory with a microSD expansion slot, FM radio, Bluetooth 2.1 A2DP, 3-megapixel rear camera and a 3.5 mm audio jack. Two models are planned, an 850/1900MHz US release in the third quarter of 2011 and a 900/1800MHz Europe and Asian model release in the second quarter of 2011.