Well today is Earth Day. This year it is even more celebrated because everyone is starting to realize how much we, as a world, have to come together and start taking care of our planet. We are seeing more and more technologies go "green" and this is no exception with cell phones
Reading an article on treehugger.com
"Another cell phone is getting a solar panel slapped on its surface, showing that going solar is juuuust starting to become all the rage among mobile phone makers. At least in a limited way."
The specs of the phone are still limited
"AU (KDDI) and Sharp are presenting a new phone in the Japanese market that has a solar panel embedded in its lid. Users can leave it in the sun for up to 10 minutes in order to generate enough energy for 1 minute of communication or 2 hours on standby"
Now really that isn't too much time and it will take hours if not days to charge your phone in the sun, but at least it's a step in the right direction and hopefully this will become more common in the future.