I hate phones! I feel slightly panicked when my phone rings. I never talk on my phone unless someone makes me do it, by calling. It really stresses me out.
I also prefer chatting on a forum compared to talking to people in person or on the phone.
One thing that can still affect me though, I'm not sure if it's mutism, but I think it might be, is if I'm talking and something throws me, it's like my mouth locks shut. I try to push the words out of my mouth but it just locks up and I end up with this weird purses lips expression on my face.
It was even worse when I was a kid and I had to deal with this vicious bully of a headmistress (she made Miss Hardbroom look like a day at the beach). When she spotted me she would look for something to pick on me for, and as she was berating me I'd get this mutism thing happening.
Invariably she'd start interrogating me with stupid questions the kind that put you in a double bind. Then it would happen, this weird locked up, pursed lips thing, then she would go nuts at me for "laughing" at her.
I always wondered if it was like a very dilute version of Shell Shock. I've seen pictures of soldiers in the midst of a terrible distressing event with huge grins on their faces. But in reality they are in a catatonic state of distress, they look like they are having a great time based on their apparent expression. It's quite horrible.