2 is the bigger issue for me, but from a courtesy angle: I was raised to view talking on your cell phone around other people as impolite.<p>For those unmoved by propriety: picture the last time you were on a bus (or other public space) and saw a bunch of people texting or otherwise using their devices silently. Imagine this picture where everyone is shouting into their phones in order to overcome the background noise of everyone else shouting into their phones.