As of this week, GameStop has begun accepting iDevice trade-ins at its retail outlets for in-store credit. 9to5Mac is reporting that GameStop will soon offer Apple's entire lineup of iDevices for sale, and it's speculated that GameStop is accepting new and used trade-ins first to make room for new products this Fall, like the iPhone 5.
Resellers are gearing up for a mass influx in used iPhone trade-ins, with Apple's next smartphone slated to make its debut before the end of next month.