If you didn’t sell your iPhone 4/4S before the announcement of the iPhone 5, you’d better do it soon before its value drops considerably. Reports have already come in that iPhone trade-in prices have started to drop on most major iPhone trade-in sites.
In the two days since Apple announced the iPhone 5, values on used iPhones have already dropped as much as 8%. Once the iPhone 5 hits shelves next week, values are expected to drop even faster.