According to data released by ComScore and reported in the Wall Street Journal, the next iPhone will have big upgrade potential. Unsurprisingly, owners of older iPhones are most likely to buy the new model. 46 percent of iPhone 3G/3GS and 43 percent of iPhone 4 owners plan to exchange their handsets for a newer version. When it comes to newer iPhones, 15 and 24 percent of iPhone 5C and iPhone 5S users are planning to upgrade.
You will find more statistics at Statista