A simple way to put an "If Found Call..." screen on your iPhone is to create a graphic it, save the image to your iPhone and then uses it as your wallpaper. This way it's the first thing on your startup screen, the finder would see when they turn on your iPhone.
You can create a screenshot of the text in a word processing program or create a slide in Keynote or Powerpoint. Or for a simpler way, draw it on a posterboard and use your iPhone to take a picture of it.
"If Found" Message
