Canadianpolsci, you are right that no one will be accepted or rejected because of phone calls, but there were always those few who started calling early and often. No one minds if it's mid-March and you inquire, everyone will remember your name if you start calling two days after you submit your app and expect a response. Believe me, it happens. But yes, if other people have clearly heard from your program and you haven't - call. If you don't think anyone has heard from the program and it's early, it probably won't do any good.