Deploying iPhone applications to testers involves creating an ad-hoc distribution package that they can install through iTunes, rather than the App Store. To do this, you need to get each iPhone’s identifier or UUID code.
There are two steps to this - the first is to get your guinea pig to connect their iPhone and fire up iTunes. Then on the iPhone Summary page, they’ll see their phone’s serial number, like this:
The serial number isn’t the one you’re after - clicking on the Serial Number will flip the display so that it shows the eleventy-billion digit UUID, like this:
Thankfully, you can copy the number even though it looks as if you can’t select it on the screen - just hover the mouse pointer over the number, and Cmd-C / Crtl-C to copy the number onto the clipboard.