Recently I dropped my iPhone 3G on the floor, which I'd done several times before with no consequences. But this time, the vibration switch (just above the volume control) on the side of the phone doesn't seem to work now. Even switched into Vibrate Mode, all sounds still come through loud and clear. The graphic will still appear on the screen indicating that it's in Vibrate Mode, but it isn't. I suspect that the switch itself is busted somehow. This is a problem because I don't know of a way to completely silence the phone without turning it off. Anyone had something similar happen? Is this something the Genius Bar could help with? Thanks in advance.