Happy iPhone Day, Now Go Sell Your Old One

Here's a request for anyone with an extra iPhone or two lying abandoned in a drawer somewhere: Get rid of them.
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Today, technology geeks and gadget fashionistas celebrate the expected release of two new Apple iPhones. Tomorrow, the real retail fun begins, as the iPhone 5 is tossed onto the mountainous pile of out-of-date products.

The market for used iPhones is booming. Apple knows it needs to think cheap (it's said to release a cheaper model today), and refurbished older models are already attracting budget-hungry shoppers and buyers in emerging markets as Apple, U.S. phone companies and retailers compete with offers to attract consumers to sell or trade in old phones. Even Wal-Mart joined the game today with a new smartphone trade-in program.