Not only has the iPhone's operating system and user interface changed the way we see smartphones, it's led to a swift downturn in fortunes of both RIM and Nokia, once two kings among mobile phone companies.
Indeed, it's been five years, despite the fact that last year's iPhone was dubbed the iPhone 4S and not the iPhone 5. Over that time, it's been estimated that the iPhone has garnered Apple some $150 in revenue and seen 250 million of the devices sold.
Its main competitors, Android and Windows Phone, don't usually see this type of wild adoration. There are, to be sure, fanboys for all the platforms, but iPhone fanboys are among the most vocal and defensive.
That said, Android still owns the global market for smartphones, and that's not going to change anytime soon. There is no love lost between those two competitors, however. Notice, for example, that there is no Google Doodle today.
Happy fifth birthday, iPhone.