A lot of people keep their iPhones every year instead of selling them. I always sold mine to fund the next purchase. Looks like that was a good idea because you can purchase cheap iPhones on eBay. Just spent $200 on an iPhone 2G, 3G, 3Gs, 4, 4S with the boxes and accessories. iPhone 5 starts to get more expensive but I can wait 5 years and grab a 5, 6, 7 for likely the same price.