We often hear about iPhone sales during Apple's quarterly earnings report, but we don't talk about secondary sales very much. This is the market where used iPhones in various conditions are bought and sold. I've been an active participant in this exchange, often selling my old iPhone or iPad to get the current year's model.
AllThingsD details a recent Consumer Intelligence Research Partners (CIRP) report which reveals that 53 percent of iPhone 4S owners got rid their old handset to buy the new one. These re-purposed handsets were predominantly iPhones (49 percent), follow
