It's a business application.
Newber Home | The First Location-Aware Business Number for the iPhone
We had a booth at CES and attended the media event at Mac World where we were *supposed* to roll it out. The app is designed to get business users to get rid of their BlackBerries and get them on iPhones. The iPhone has next to no useful business apps at this time besides Mail with Exchange support.
Unfortunately, the last 3 weeks I have been porting it over to the BlackBerry due to the fact that we have to try to recoup some of the money we spent developing the app.