It depends on who I'm going to call and what I expect to talk about.
If it's a first phone call with someone from here, I like to at least think about what I might say.
No, unless it's work related. Buuut, if there's a long voice note due I'll sometimes do a quick checklist of things I want to cover because I can waffle and get rather excited and then not talk about very much at all. It's a hard life little star.