This is a groovy phone, but while phones may be getting more complex, it seems the verification effort isn't quite keeping up.
The phone has handsfree mode (speakerphone) as well as capabilities for a bluetooth wireless headset (as well as a plethora of other snifty features)
The bug is simple. During a call switch to handsfree mode. Then bring out your bluetooth headset and pickup a call.
You'll hear nothing but a loud buzz.
(And don't get me started over the interface (or lack thereof) for switching to/from the bluetooth headset - grr...)