I've never had an official phone session but over the years I've had a lot of out of session phone contact with my therapist, which was probably the most helpful part of my therapy, to know he was there and really meant it. My therapist did once say we could have phone sessions if I needed it while I was on vacation. I didn't need to though. However I once called before a session because I was feeling very ill and couldn't make it to his office so I asked if we could do it over the phone, but my therapist just let me come in later and do the session when I felt better.
Basically I like it that distance does not mean he's not there for me when needed. I also like the flexibility - I feel safe when things are flexible and negotiable. I miss the eye contact and maybe touch, but my therapist's voice is comforting (if he's not using it to yell at me

). So I like the contact. Somehow we usually have better connection over the phone, we would usually argue in person and repair the relationship over the phone ... I think this has happened a lot because our phone conversations are more focused. I'm sure it's not for everyone but it's been helpful for me.