There is in interesting picture here of an iPhone hooked directly to a CISCO switch via a serial adapter that someone built:
http://www.computerworld.com.au/slideshow/...fp=4&fpid=5I notice it's in the Australian version of Computerworld so maybe there is a need for this down under?
Note: I talked to a guy on our Networking team who is "very" interested in this for programming the switches from his iPhone! I guess it's more useful than I'd thought at first. I'd be surprised if there isn't a commercial device to do this!