http://www.telegraph.co.uk/technology/mobile-phones/10446025/Scientists-discover-method-of-charging-phones-with-microwaves.html A few years ago a friend asked when can they get rid of the cord (USB power). It's coming 900mhz cell phones should be able to recharge when they are not in use (soon as in years!) The Technical detail if you must read it can be found at : http://scitation.aip.org/content/aip/journal/apl/103/16/10.1063/1.4824473 Gary