Since the title tag is used for rankings by Google and no one is searching by typing in the phone number, you are wasting your title tag space.
Better to put the phone number towards the beginning of the meta description. This way people can see the phone number and call it without having to click anywhere. Since you are concerned with calls as a conversion, clicking through to the site is not a prerequisite, you just want them to call and this gives the phone number up front.
See the meta for <cite>www.drgeorgerappard.com/</cite>