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When the iphone was first launched in 2007, the mainstream mobile phone on the market was still the traditional keyboard plus small screen technology, even if it was touched by a stylus. However, Jobs put forward the concept of ipod ++ Internet browser+mobile phone at the iphone conference. The large screen supporting multi-touch turned the mobile phone into a mobile terminal instead of a simple calling and texting tool, which completely changed the mobile phone market. At present, the mainstream large-screen touch phones on the market are basically designed with reference to the concept of iphone.
Iphone4 is just the biggest upgrade of iPhone (iphone 4 is a big leap since the original iPhone. Iphone4 is the biggest step since the first generation of iPhone).