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The smart phone is thus a new class of computing device, correspondingly demanding a new class of user interface. The smart phone is truly personal t's carried by just one individual and at all times. However, we need to personalize it not only for the individual user but also for the wireless operator delivering a custom bundle of wireless services. The new UI must be easy to customize, update, and maintain. We propose a new UI solution in which the Web browser broadens its role beyond browsing external content to also function as the handset UI. Seen in context, this is only the next step in the continuing evolution of today's wireless ecosystem. Here we describe trends in mobile Web browsing that culminate in the browser as the handset UI.