Finally, I understood why "Apple redefined the smartphone ".

"The earliest representatives of smartphones are BlackBerry in Canada, followed by NOKIA. their smartphones have basically not been moved away from the phone box, and their mobile phones have added the email function, it is only easier to use than a traditional mobile phone. It is totally different when the smartphone arrives at Steve Jobs. It is more than an ordinary mobile phone with an iPod player. It also has a complete, networked computer and the main functions of a general television ."

(From http://alluringfox.blog.163.com/blog/static/1130086720119694122652? Touping)