One can at least assume that most people carrying phones don't have their microphone and camera on all the time - with Glass, that intrusion into privacy is designed to be unavoidable.
There is again absolutely no difference between phones and glass in this regard... Android phones now have trigger word detection ("OK Google") available as well, which is all that glass did. Again like a phone, the camera is only on when triggered.
The only real difference is positioning, but you can hold a phone up, and most people won't notice.
The only real difference is positioning, but you can hold a phone up, and most people won't notice.