Overcoming Phone-Call Anxiety
I have found in my 20 years on this earth that discovering everything about a woman can be very difficult even if you are with them for a long time.
One thing that has always plagued me was the low confidence I had to talk to a woman on the phone. My suggestion to build confidence is to find a helper. A female friend who loves to talk.
What you do is call this friend before you call the other girl that really means something. Then you can build your confidence on someone who doesn't mean anything at all for the one that does. It worked with me and hope it works for other people.