Where old iPhones go to die

In the wake of Thursday's iPhone 4 launch frenzy lies as trail of unloved, no-longer-needed iPhones cast off by owners trading up for the shiny new model. Analysts estimate that as many as 1.5 million iPhone 4s were sold on the first day -- and three-quarters of them went to buyers upgrading from a previous iPhone. That means more than 1 million iPhones are headed for the graveyard. Where do old iPhones go to die? Some, inevitably, wind up in the trash or the back of a junk drawer. But many find their way into the secondhand phone market. On Friday morning, more than 5,000 iPhone 3GS units were available on eBay. Companies that buy, rehab and resell old mobile phones and PDAs are having a bonanza right now.