Let’s start with the obvious: the iPhone has been a massive, unequivocal success. Every subsequent release seems to break the records that the last one set before it, and now with the biggest hardware overhaul in the phone’s history rumored to be coming this fall, the books are primed to be rewritten once again. But before any of that happens, Jordan Weissmann of Slate has decided to take a step back and see just how big the iPhone really is (and we’re not talking about the 5.5-inch phablet). The question Weissmann posed was this: “If Apple’s product lines were their own companies now, which corporations would they stack up against?” Using this quarter’s earnings, Weissmann discovered that Apple’s iPhone line (easily its most successful product line),