Originally Posted by IlliniDawg01

I keep waiting for the Solar power technology to improve to the point that a solar panel is built into the back of the phone for built-in charging or topping off. This would work great on the dash of a car.

edit:

Appears we are getting close...

LGSolarPanelPhone | Mark's Technology News

Solar Powered Cell Phone In The Works : TreeHugger

Samsung Blue Earth, a solar powered cell phone

Archive for Chinese electronics : Ecoscraps

Another option would be a phone that charges from motion like a lot of watches do.

DaveJ