The increasing functionality and numbers of mobile banking platforms, the growing sophistication of criminals, and the popularity of smart cell phones create the potential for mobile banking security issues, but industry watchers have widely divergent opinions about how serious the threat really is.

Smart phones in particular-devices which can surf the Internet and run applications, such as the iPhone and the Blackberry-are supposedly the latest threat vector. And even banks not in the mobile banking business aren't immune since customers can simply surf to their regular banking Web sites using the browsers on their phones.

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