BTW, I should add that I have a Droid Razr Maxx...simply for the battery capacity. I don't like the iphones. If the Samsung Galaxy Siii had the razr maxx battery I'd have that. I do travel with a Nomad 7 Solar Panel ( Nomad 7 http://www.goalzero.com/shop/p/11/Nomad-7-Solar-Panel/6:3/) by Goal Zero (http://www.goalzero.com/). So, outside of getting stuck in a tunnel or cave, I can solve the smart phone power drain issue.