What's Hot: Used Apple iPhones

After the iPhone 3G launch, consumers want the original, hackable iPhone, and vendors are springing up to sell themfor a premium

As the head of a company that sells used consumer electronics, David Chen follows sales of the iPhone with the precision of a mathematician. At the outset, the price of the first version of Apple's (AAPL) music-playing wireless device behaved as expected: When the newer iPhone 3G hit store shelves, demand for the earlier iteration plummeted. Then the unexpected happened.

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