Occasional, staffers tend to view phone calls as taking them away from their work. Your understanding of this is a plus. Check-out time is six o'clock. You can call for the application materials at any time, however, you will need to turn in your application early . Deadlines are usually sometime in March or early April.
Some offices wait until a separate deadline for the final selection of interns.
The cover letter Be brief and to the point . Do not reiterate what's in your resume here. Be sure to address the hiring staffperson directly, using the appropriate title and address with correct spelling. Be neat, complete, accurate and professional. They're looking for people with a lot to learn.