Internet is now used in many aspects of daily lives. People rely more and more on the
Internet. People with high mobility in this era want to have Internet connection anytime and anywhere; they want to improve their work efficiency. Along with the improvement in mobile broadband services, this tendency stimulates the increasing demand in the mobile device market. Sales of mobile devices, such as smartphones and tablets exceed PCs. And now,mobile devices are transforming our lives in almost every way; connecting our physical and digital worlds.