The deal works like this. Bring in your working Apple iPhone 4 or Apple iPhone 4S and Best Buy will give you a credit of $150 toward an iPhone 5. The remaining $50 balance is taken care of thanks to a $50 price cut that the tech retailer has on the iPhone 5 until June 29th. And you must be eligible for an upgrade with your carrier.
The deal is good only inside Best Buy or Best Buy Mobile stores. Perhaps this way you can make some impulse buys when you trade-in your older iPhone for the Apple iPhone 5. You'll need a new case, of course, and perhaps some other accessories that just happen to be hanging up right near the mobile department of the store.
source: BestBuy via USAToday