The mobile user interface is becoming a key differentiator for mobile telephony devices and services. The increased focus on usable, emotive, and branded user interfaces is the result of three key drivers. (The term "device user interface" refers to both the "core" applications management environment and applications such as contacts, messaging, and call control, as well as third-party applications such as games.) First, standardization of mobile platforms, networks, and screen technology allows the production of more-powerful handsets at lower cost. Such handsets are capable of presenting complex and display-rich user interfaces (see Figure 1) that are more attractive to…
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