Recent rumors about a September iPhone 5 release have caused a 70 percent increase to eBay's smartphone trade-in program. eBay said (via CNET) the number of trade-ins started to increase around the same time several well known sources purportedly confirmed Apple will hold a special event to announce the new iPhone on September 12. The company said "nearly" 100,000 smartphones were traded-in during a three day period following the announcements.
The 16GB model of the iPhone 4S topped the trade-ins, followed by the 8GB iPhone 4 and 32GB iPhone 4S. Last year eBay received 375,000 trade-in offers for smartphones when the iPhone 4S was officially announced. 89 percent of those smartphones were iPhones.