I've always been scared of the phone and my T would always listen then tell me we would discuss whatever at our next session. She wouldn't carry on whole conversations/therapy on the phone, wants the face-to-face thing.

That's great that you can do the, don't call me back, just "hang on to this". That does sound useful. It really gets lots better when you only think of/talk about things during the session and have "room" when you're not at T for "life" and thinking about other things instead of T/sessions.