I have limitted knowledge in this area, but the only cell phones I know with an interface connection are the newer intelligent phones with USB connectors.
I've had cell phones since they first had small LCD screens and slide-out antennas, before StarTrek flipflops, after the humungous first models that weighed 5 pounds. The only jacks I remember were either for charging or earplugs.
The newer phones also offer bluetooth and wifi connectivity.
Robert
EDIT: Check this:
http://www.dudek.org/blog/257
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