In addition to geotagging what about EXIF data that shows the phone model.
Here is the EXIF data from one of my pictures:
Make: SAMSUNG
Model: SCH-I500
Aperture Value: f/2.6
Color Space: sRGB
Exposure Bias Value: 0 EV
Exposure Program: Program
Flash: No Flash
Focal Length: 3.79 mm
ISO: 50
Metering Mode: Center Weighted Average
Shutter Speed Value: 1/220 sec
Date/Time: Fri 10 Sep 2010 11:44:13 AM EDT