iPhone 4 - redesign time
Unlike the iPhone 3GS, the next iPhone represented a much more radical redesign. Unveiled on June 7 2010, the iPhone 4 was a different shape, with glass on the front and the back and a metallic antenna running around the edge. It also introduced some major new features - the super-crisp 'Retina Display', FaceTime video calls, a better camera and a six-way gyroscope for improved motion controls. And like its predecessors, it saw massive queues forming outside Apple Stores on the day of its launch.