What cyrnel and spindles said. G networks don't have to allow B devices, and G-only cards wont work on a B network. That said, I've only seen a couple of G-only cards--most support at least B, and often A. But we've had a couple of people come in with wireless problems that ended up being because they had a G only card that wouldn't work on the campus B network. The cards were always no-name cheap pieces of junk though--I don't think I've ever seen a major name card that didn't include B access as well.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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