Apple's iPhone 5s and iPhone 5c were most popular with previous iPhone owners upgrading from older iPhones, according to new data gathered by Consumer Intelligence Research Partners. Approximately 65 percent of total iPhone 5s/5c buyers in the United States previously owned an iPhone, compared to 55 percent of iPhone 5 purchasers a year ago. While 12 percent of consumers who purchased an iPhone 5 last year were upgrading from an iPhone 4s, just 6 percent of iPhone 5s/5c purchasers upgraded from an iPhone 5, with the rest of the former iPhone buyers coming from older models like the iPhone 4 and 4s or non-iPhone devices. The lack of interest from iPhone 5 owners is likely due to the fact that the iPhone 5s and the iPhone 5c are somewhat minor updates that have not resulted in a change in form factor
