This is one of those glitches that many iPhone 5 users may never encounter. But if you do, it's good to know that it's a known issue. An iOS developer was the first to notice that if you scroll diagonally by rapidly swiping back and forth on an iPhone 5, the display seems to freeze momentarily. After the developer posted about it online, Recombu, a product-comparison site, was able to replicate the glitch. They've posted a video demonstrating what happens. The video shows two iPhone 4S models side by side with two iPhone 5s.