Gartner predicts that users will move to pocketable devices by 2012: http://gartner.com/it/page.jsp?id=593207

This means that we need to start thinking about content management on mobile devices. There are already systems available that enables full encryption on these devices, but they are not broadly deployed yet.

A different way of controlling sensitive information on these types of devices would of course be to give information persistent protection at the aggregation points such as email servers, and for line of busines applications at the web interface. DRM is a good solution for this space. You can control who has access when, and to a certain point where, compared to just letting the information get to the devices unprotected.

Here is a link to what Symantec has to say about mobile phone security: http://www.symantec.com/about/news/release/article.jsp?prid=20060404_01