I also remember being told he doesn't like being caught off gaurd and needs to really have control over phone conversations - what he's going to say, how he's going to respond etc.
I found this interesting. My survivor friend hates talking on the phone and I've never quite understood why. I've actually never met him in person and we've never talked on the phone. We've just communicated online and via text for the past 2 years. I've asked to talk on the phone and every time I bring it up he gets really quiet and stops responding. At first he said it was because he had a stutter. I told him it wouldn't matter to me, I'd like him just the same. Now he just says he doesn't like talking on the phone. I wonder if it might be related to needing to be in control and not being caught off guard or made vulnerable.