For the best price, sell your old Apple iPhone now
Last year, the Apple iPhone 3GS and Apple iPhone 4 had a sharper percentage drop in price just prior to the release of the iPhone 5, than the iPhone 4S had. If the low-cost Apple iPhone 5C turns out to be real, we could see a larger decline in the value of older models.
If you're looking to beat the crowd and fetch the best price for your current Apple iPhone model, now is the time to let go and sell the handset. If you wait too long, your iOS flavored handset will be worth less than it is today.