从头梳理传统功能手机的软硬件系统， 以此 为基础，分析当今智能手机的软硬件系统。-Scratch combing the traditional functions of mobile phone hardware and software systems as a basis for analysis of today' s smart phone software and hardware systems.

Cell phones and personal digital assistants (PDAs) have become indispensable tools for today s highly mobile workforce. Small and relatively inexpensive, these devices can be used for many functions, including sending and receiving electronic mail, s