eZ Flow includes templates tuned for mobile display. These templates are examples that show how you can display content on various devices.
Displaying content on alternate devices is enabled via the eZ Publish siteaccess system, with a separate siteaccess for each type of device. Each siteaccess contains custom templates, specifically:

• Pagelayout
• Article full view
• Gallery full view

Please visit the template documentation for eZ Publish for more specific information.

The Apple iPhone includes a full-featured webbrowser which means that it can display most website content (excluding elements such as Flash). It is normal to tune the content specifically for mobile devices. In the case of iPhones, you simply provide some templates that are tuned for the display size (320 pixels wide).
For information on how to tune your CSS and templates for iPhone, visit Apple's development resources.