In that email, put at minimum the area code and prefix, such as "248-683" or put in the whole number, it doesn't matter, as long as the area code and prefix are dash seperated.
Then see what happens. Note that its formatted to fit on the screens of most cellphones. Use in combination with ANI for loads of fun.
(And no, dankaye, I haven't gotten a chance to import that info into my database yet :-> )