" 

 :The multi-touch screen is a hardware feature. But that feature makes no sense when the iPhone is turned off. It is relevant to ""this article"" to show the multi-touch screen at work. Showing the image of the virtual keyboard is one of the best way to do it, because words just don't sufficiently convey how it works. You can also notice that the image of the keyboard, one used in this article, shows a person's hands on the keyboard. That kind of the image doesn't belong to the iPhone OS article because it should only show what appears on the screen of the iPhone, not a person operating it. (So, a video of a person typing with the virtual keyboard is actually better but that's another story.)    "