JPG file - How to tell where it came from?

I use Dropbox to send images I capture on my iPhone as well on my Droid phone. On Dropbox, these files are sent to the same folder (Camera Uploads). I am trying to be able to differentiate between which phone (iPhone or Droid) the JPG files originated ans based on which phone created the file, do something different with it, by creating two Hazel rules (one for each). I can't seem to find an easy way to do that. Anyone has encountered this? Any help would be appreciated.
The iPhone JPG properties are here:
http://www.smugmug.com/gallery/25972778_xHSqCm#!i=2154651598&k=wQ84bz7
The Droid JPG properties are here:
http://www.smugmug.com/gallery/25972778_xHSqCm#!i=2154651593&k=VzJj9mD
Thanks,
Tony
The iPhone JPG properties are here:
http://www.smugmug.com/gallery/25972778_xHSqCm#!i=2154651598&k=wQ84bz7
The Droid JPG properties are here:
http://www.smugmug.com/gallery/25972778_xHSqCm#!i=2154651593&k=VzJj9mD
Thanks,
Tony