David Smith shares his application usage statistics for iPhone screen size. What really caught my eye is that the 5.5- and 3.5-inch form factors are neck-and-neck. I’m surprised that the 3.5-inch size is still holding strong, but I expected 5.5-inch iPhones to be more popular than they are. Perhaps I notice them more often because they’re larger, but I see a lot of Plus-sized iPhones on a daily basis — more than this graph suggests.