This is my first post in a looong time, but this one hits close to home:
Don't text or talk on your phone in the bathroom. First, it is gross. Second, the bathroom is not a social place. Do your nasty little business and get out. The worst is when you have to drop #2 and someone is in there texting. This is not your home bathroom, you do not relax here and kick your feet up. Everyone has to share. Get in, get it out, then get yourself out.
The same goes for reading material. I saw someone I work with bring several folders, pens and a notebook into a stall. It's not a backup office!