To begin with, using mobile phones is one of popular methods for people to communicate, relax and do business. By using call or video phone, text message, we are able to keep in touch together despite a long distance. These days, with the significant developement of cell phones, they enable users to entertain such as surfing the internet, sending photos or downloading videos and games. According to a research, the number of people accessing the web through mobile phones is now accounting for well over 15% of worldwide internet usage. Furthermore, some Office applications for mobile phones, for example, Miccrosoft Office are helping employees do their business more effectively.