Just a few years ago, one could expect little more from a handheld computer than a convenient means of storing and retrieving data such as phone numbers and to-do-list items. Today, these devices have evolved greatly in terms of power, functionality and network connectivity, but as handheld computers and the mobile operating systems that drive them grow more complex, so, too, grows the potential for the sort of security vulnerabilities that plague their desktop- and server-based brethren.

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