On Friday, the US branch of Best Buy will be launching another promotion in which shoppers can get a "free" iPhone 5. People who bring in an iPhone 4 or 4S in good condition can get at least $150 in credit, which is enough to cover most of the cost of a 16GB iPhone 5 with Best Buy's current $50 instant rebate. Should a used iPhone be worth more than $150, Best Buy says it will make up the difference with a gift card.
