I have 0 familiarity, but a quick google turned up:

http://www.vbulletin.org/forum/showthread.php?t=130983
Which looks vaguely relevant, if useragent is considered a good proxy for hardware. (We could also flag iPhone posts that way, which would be entertaining with some people using an unmodified iPhone UA on their tablets...)

http://www.vbulletin.org/forum/showthread.php?t=102270
Implements mood, which could be used to show what device that person is currently using...