The history of the iPhone line of phones begins with a direction from Steve Jobs who firmly believed that cell phones were going to become important devices for portable information access, and that what cell phones needed to have was excellent synchronization software.
On June 29, 2007 the first iPhone was released.
Until iOS, smartphones either didn't have a touchscreen or used a resistive touchscreen and a stylus. The iPhone changed that with its touchscreen, Apple's revolutionary user interaction model that made touch the primary interaction model.
The iPhone 4 and iPhone 4S doubled the resolution in both screen dimensions, thereby qudrupling the number of pixels in the same amount of space.
The iPad has a larger display and also uses a different aspect ratio and resolution. The iPhone 5 was the first departure from the traditional iPhone and iPod Touch screen size, increasing it from 3.5 to 4 inches, and the resolution was increased to include extra screen space.
of the world's iPhones are in the USA only.
of the iPhones are owned by people 20 years old or younger.