This is based on the statistics:
"73 percent of iPhone owners used their mobile devices primarily for personal reasons, such as entertainment. By comparison, 59 percent of owners with other types of smartphones — from manufacturers like HTC, Research in Motion and Nokia — primarily used their devices for business and work-related needs."
Even if you use your iPhone as your sole work communications device, you probably also use it more for personal reasons. It does have a video iPod built-in and access to thousands of games, camera and location-based utilities for personal use. For those 27% who use the iPhone primarily for work, you are missing out!
Do you use your car primarily for work?