IPhone is a series of mobile phones with iOS operating system released by AppleInc. As of April 20021year, Apple Inc has released 24 mobile phone products, and the iPhone series models have been equipped with AppleSilicon self-developed chips since the iPhone4. TouchID first appeared on the iPhone5s; IPhone6s and iPhone6sPlus added 3DTouch touch control on the screen for the first time; Wireless charging first appeared on iPhone8 and iPhone8Plus models, and Qi(Chee) wireless charging standard was adopted.