T1, I rarely contacted between sessions. She always said to call if I needed, but I knew usually I'd get her voice mail and if she called back, it'd be only 5 min or so. A few times I did have an extra session .....
T2, she gave me her cell right away, but I didn't call at all for several weeks. Then I called once when I was out of town and not for several weeks again after that. Then there was a BIG thing that happened and so I thought, screw it, I'll call and see what happens. She talked to me for quite a while. And that sort of started a thing where I had her permission to call a time or 2 between sessions and she gave me a ton of phone time, so that's the way it was for a few months, until I came back home. I didn't abuse the privilege, but decided if she offered it to me and it was helpful, I'd use it. We ended up doing more and better work on the phone than even in session!