Apple's mobile platform (née "iPhone OS") has changed a lot over the years, from the halcyon days before even the App Store ("an iPod, a phone, and an internet communicator," as Steve Jobs originally put it) through its feature creep of notifications, multitasking and even cut, copy, and paste — and along the way, some breakthrough ideas. Here's a visual history of iOS, from its smash-hit debut, through apps and Siri, all the way up to the next version coming this fall, iOS 8.