My very first time with my one T... I answered my phone. I was like "I'm so sorry but no one ever phones because I hate it, so it must be something important" (I was waiting for a call I think). It was actually a friend, who had misread a message I sent and thought I needed a phone call ASAP. So I was like "Umm nope things are good?" and clarified the message.

Felt super embarassed.

I've also had to take a call while teaching - I was expecting it and told my class (grade 6) that if my phone rang, I neede them to go silent and I needed to take the call. This happened a few days actually and they were great about it (I had bought a new laptop and it got "lost" in the mail... so I was really stressed out).

But to MAKE the phone call during a session??? I'd be upset. If someone said "I just remembered about this and if I don't call right now then X is going to happen!" then I'd be ok because things like that happen. But it would be very important to me to have it explained BEFORE the call was made - so that I guess in a way I would understand why, and be able to "give permission" in a way??