Thank you for your post.
At this time, FileMaker, Inc. does not have a FileMaker product that works on the iPhone. There is a third-party product FMTouch that allows you to use FileMaker Pro data on an iPhone. Please visit www.fmtouch.com for more information.
You may also want to think about using FileMaker and PHP to bring your database to your iPhone or Treo. We created a FileMaker web builder called JumpStart that allows you to quickly build a FileMaker powered website that works on the iPhone and other mobile devices.