There are solar cases for you phone.  I think this is a great idea.  If you are lost in the desert and you phone goes dead that solar charger might save your life.  For the everyday dude the battery would last a lot longer.  I cant wait for mine.  Now it might be the cheapest accessory for your phone but it might be better than carrying a extra battery.  I think that all our portable devices could benefit for some solar.  Mo Howard West Virginia Football can put solar in their helmets.