You don't just call offices to ask about status and show interest; you only want to contact them if you have a good reason/excuse to...like to give them useful information you may have left out of your application. Don't ask about status before December 1st unless you've heard nothing and want to check that the office received your application materials.
Email is so much better. When correspondence is in writing, it can be added to your file at the school so the admissions committee can see it. They're not going to know what you actually said if you were just talking to the office secretary. And from the secretary's perspective, it is annoying to have to drop whatever else they are doing to field a call when an email would have sufficed.