I agree and can't even elaborate on all the above posts, except for saying your pouring salt in your wound everytime you pick up your phone.
Having gone through the stages and even repeating some just recently, if you truly are at the anger stage ... then get angry!!! Re-read your posts, think about the horrible things she's done, think about why you are allowing her to do this to you. Embrace the anger & stay there for a little while, it will make it that much easier not to pick up the phone. At least that was my experience.