Wanna buy a used iPhone? Best Buy has ‘em. Best Buy (BBY) believes the refurbished Apple (AAPL) iPhone will appeal to cost-conscious users during the economic downturn. The retailer now sells used versions of the iPhone 3G for about $50 less than new devices Reuters reports. This raises a basic question: Is the gizmo a status symbol or nerely a communication device? Those who see the iPhone as a status symbol probably would recoil from a used model; those who see it as just a tool (and are pinched financially) would almost certainly welcome a refurbished device. But it’s hard ...