The ClearWire representative couldn’t explain it or get it to work. He finally set up an unprotected network, and that did work. (And was acceptable for my use, since I use SSL for the e-mail accounts I check from my iPhone.)
My MacBook Pro had absolutely no problem with the same networks. Although when I tried copying something from a friend’s PowerBook, it was glacially slow.
I believe ClearWire was running with standard NetGear base stations, but I don’t know how they were configured.
The ClearWire representative was helpful (hi Sky!), but obviously not there to support the iPhones at the show. Still, it was troubling that they didn’t work, and this doesn’t make me want to buy their service.
It was cool how the iPhone kept working (even if I had to drop to EDGE speeds).