These days, it’s possible to find accurate performance data for most of the major purchases we make in our lives. If you’re shopping for a car, you can find out its gas mileage. If you’re shopping for a plane ticket, you can look up each airline’s on-time rate. When you go looking for a new cell phone, though, you enter a data-free zone in which every company is free to claim that its devices offer spectacular service. If customers or the media disagree, the companies can argue—as Apple did last week—that the critics are just carping, because nobody has any definitive data that can prove them wrong.
