I'm in the iPhone Developer Program, and have access to beta firmware. However, I also have a factory unlocked iPhone 3GS that i got from Australia. It is important for me to have an unlocked phone, because I live in Montana where AT&T doesn't exist. I'm worried that if I install beta firmware on the factory unlocked iPhone, I will lose the factory unlock. When the 3.0 beta was released, I vaguely remember reports that this happened. Does anyone have any information on this?