You are really not very bright if you can’t think of ways to hold a phone or place it on a surface inconspicuously to film someone. You can hold the phone casually, you can pretend to be doing something like talking/listening on the earphones while gripping the phone in hand, texting or web browsing etc. There are people who have recorded abusers with camera phones, and the abuser had no clue. Here is one example http://www.youtube.com/watch?v=_0H5AkGToyY … there are other examples. You may get some shaky video, but it’s definitely possible to record somebody without cueing them in to being recorded. You can also keep a phone in your shirt pocket with the lens sticking out and film stuff. Compare that with Google Glass where your brain has to go against instincts and avoid staring at the subject you are filming — and of course when people see someone with it on they will know to fix their hair.