I would just use email. It's faster and more convient for both sides. Also, unless ur schools really far away from ur home, i.e. maybe like east to west coast, i'm not sure how much of an effect that will have towards u getting an interview invite. you might be better off sending a letter of interest. as far as i've heard, there are very few schools that are receptive to "in the area" emails, mainly NY schools like cornell and columbia. good luck though!