hnology will continue to see many advances, with up to 5-megapixel models emerging in 2006. A recent InfoTrends/CAP Ventures study projects that more than 860 million cam- era phones will be shipped worldwide by 2009, accounting for 89% of all mobile phone handsets shipped (www.capv.com/home/Multiclient/MobileImaging.html) However, there may be a backlash against these devices in some cases. For instance, many establishments ban camera phones because they fear the owners will use them inappropriately or illegally. The fourth major development involves the addition of music-playing capabilities to the handset. Starting in 2005, MP3 players embedded in the handset started the trend toward entertainment being a key function of a mobile device. It also led to competition in terms of storage capacity and battery lifespan. Handsets equipped with MP3 players, FM/AM radio tuners, and voice recorders are now increasingly common, and online music ser- vices enable users to play tracks over mobile phones. Apple's iTunes has made a dramatic impact with its model for marketing and delivering digital music. It is believed that mobile music will form a key battleground for handset manufactur- ers, but the winners and losers may surprise many. The emerging fifth phase is the phase of video functions and applications, heralding handsets capable of DV, MP4, Chapter 16 Emerging Wireless Applications streaming media, and TV. Multimedia will no longer be the exclusive function of high-end handsets; it will quickly become the standard configuration for main- stream handsets as the costs to add the multimedia functions continue to drop. Just as chord ringtones, color screens, and cameras have become standard features, music and video are following. Mobile Music There is little doubt that mobile music is high on the list of mobile applications users desire and are willing to pay for. There is particularly high interest among 3G users, and it will come as no surprise that both music and gaming are ranked highest among young users. Suppor