HOW DO I ASK THIS GIRL OUT AS FRIENDS OVER THE PHONE?

always start as friends. that's how you build a bond. Girls have to feel comfortable before anything else happens. Don't be afraid...just call her, keep the phone call SHORT. (spoon feed her a little bit at a time) and mention how you had fun during coffee-mention something that you all talked and laughed about and say, "yeah, that was fun if I have time, we should do that again".