Please don't call me in class

I was just in class and someone just called me.

The person is probably not someone I know (the phone number wasn't already in the phone) but the phone rang and interrupted the whole class. My first instinct was to think "How rude, didn't they know I'm in class?" My second thought, of course, was "Of course not. It's probably a wrong number. How rude!" My third thought, as I write this, is that this should be a lesson to myself: "Leave your phone off when you don't want to be called."  And that seems like a good rule. If you call and don't get a hold of me, now you know why. (Or, my phone is out of power. Or, I'm studying somewhere with no reception.Or, I'm avoiding you.) So don't take it personal, ok?