Macworld It all started on January 9, 2007, when a visionary walked on stage to showcase his company’s latest invention. Some critics published unforgiving headlines at the time, and takeoff was far from guaranteed. Today, the device has become by far the most influential of its category, with many users considering it the gold standard. This success can be traced back to a series of transformations the iPhone has undergone over the past two decades. After launching the iOS App Store in 200...