job hunting

Hi there,
When ya'll apply for a new job, do you generally give the manager of that floor a phone call if you haven't heard anything back in a few days? I have applied for several NICU and PICU jobs at area hospitals. It has been a week since I faxed the resumes over but I have not heard anything. I called some of the managers a few days after I sent them, but I had to leave voice mails because the were not answering the phone. I am wondering now if I should keep trying to speak with them in person? Or if maybe (nurses being the funny creatures they are) it might be irritating to them? I am desperate to get out of where I am. What do you suggest I do to give myself an edge over the competition (I only have med-surg experience.) Thanks.