Here, mobile can be a cellphone, PDA, or some other wearable device. Many of the book's chapters are centred on cellphones, as this is a huge global market. Important issues are argued. Like a trend to ubiquitous wireless access [at least in the cities]. Several chapters discuss location-based services. Something very characteristic of mobile devices, as opposed to fixed desktop systems. Clearly, there is a vast advertising potential for ads that use knowledge of the person's location, to customise delivery of geo-specific messages. Related to this is the issue of privacy, covered at length in one chapter. Can the user turn off her location information?



Some of the middleware is written in Java, like J2ME, the stripped-down version suitable for cellphones. But most of the book's discussion is quite independent of whichever middleware you choose.

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