I dread phone calls I have to make for days and days, it's bad because of this. I even write out what I want to say on my laptop or something and try reading it when I'm on the phone and even then I'll screw up. It's weird, because sometimes I'll talk just fine on the phone, it's such an inconsistent phenomenon but most times I end up stuttering and locking up.I take hard anxiety drugs like ativan every once in a while, no more than once a week. I'll pick a day of the week where I feel like I'll need it the most and make all my phone calls on that day. My stutter is actually much more improved when on ativan but I realize it's not a good thing to be on. So a couple things you can do that may improve your phone calls depending on your severity. Write out what you want to say and read it like a script. I personally find when I read I don't stutter as much because my brain is following a script. Sure, I'll sound like a robot but better than stuttering imo. There are however like I mentioned perviously sometimes I'll read it out and still stutter. I think for me it's more of an anxiety issue when talking to other people. Another thing you can do is talk in an accent. A lot of stutterers including myself seem to talk just fine if we alter our voice. This may or may not work with you, for example I can talk fluently in a southern accent although it sounds silly I don't stutter when I trick my brain like that.