A man swaps his data from his old iPhone onto his newly purchased iPhone 4S at an Apple store in London. - 

This final note today, in which you get something for nothing. Dig around in your house, find out how many old mobile phones you have sitting around and sell 'em.

The website did a survey -- and yes, they have a vested interest here -- but they figure the average American has $171 worth of old cell phones stuffed in drawers someplace. Off the top of my head I've got 5, I think. (The FTC has a directory of ways to dispose of your old phones, too.)

"We estimate that each American with two unused devices has, on average, just under two hundred potential dollars," said Colin White, managing director of SellCell.

All told, that's $33 billion in old phones just sitting around.

Follow Kai Ryssdal at @kairyssdal