When I connected my iPad running iOS 4.3 to my iPhone 4 running iOS 4.3 (My iPhone was acting as a personal hotspot), my iPad detected that it was connected to another iOS device that was creating the hotspot, and therefore showed this symbol (The top left of picture. It’s the same symbol that is on the mobile hotspot menu on the iPhone in iOS 4.3):
This is interesting. I could not conclude whether my 3G iPad was utilizing my iPhone’s data connection, or if my iPad was just showing that a network had been created between itself and the iPhone, and that the iPad would continue to use its own data connection.
I’m not sure, but it is interesting.
My iPad can no longer join my personal hotspot, for some reason. I haven’t been able to test further.