I agree. Never hurts to call. Sometimes applications get lost in the shuffle. This has happened here before (applicant called and for some reason the eras application hadn't downloaded) and upon review she was interviewed. (and Yay! accepted......)
It lets PD's know that you are interested and they may give your application a more thorough review. I defiantely know it happens in our program. Likewise, applicants that come by for a 'look', I always introduce to our PD. I have seen him take special note to look through thier application thoroughly.
Hence, why when I see any SDN'ers applying to our program, I always offer.