I would be so pissed if my T were on her phone while in session with me. Or if she was just glancing at it each time she got a notification. It bugs me when I'm just hanging out with a friend and they're on their phone, but if a T did it, that would be infuriating. My T usually has her phone on her desk behind her I think. Once in a while it's on the table next to her face down. I've never heard any phone ring or vibrate though. Sometimes we look at her phone together if we're looking something up on the internet, and I'm fine with that. But if she were on it for anything else I'd be pretty angry.