With September 20 and the iPhone 5S and 5C release date almost upon us, just one odd question remains: Why can't you pre-order the iPhone 5S? And why can you pre-order the 5C? The most obvious reason for the lack of iPhone 5S pre-orders is constrained supply, most likely due to manufacturing issues affecting Apple's stringent QA, but there are some other possibilities as well, such as artificially inflating demand and column inches by forcing fans to queue up outside retail stores.