While the Internet and the personal computer have had a profound impact on
the world in which we transact, it is the mobile phone that presents an exciting
opportunity for most of the world’s population. The term “mobile devices”
of course applies to a number of devices that are becoming more and more
common. Tablet computers and even netbooks can be considered mobile
devices. This chapter focuses primarily on the mobile phone, but many of the
design principles apply, whether you are discussing a mobile phone or a tablet