I almost never get calls. I was away two weeks and had a total of three messages waiting when I got home, so my phone ringing is not usually something I think about. But, I leave it on because I worry about my dad and want to be in contact with him always.
I apologized to the class, explained my reason for having and answering the call. They were sweet. They said I was the teacher and didn't owe them any explanations. I said I did. There shouldn't be two sets of rules. They then decided I was a cool teacher and they were happy to be where they were.