I can see a mailing address and phone number of every applicant. I can see all the pertinent information of any applicant that listed one of my schools. What I do each year is email the applicants that list my schools and offer my help. Some schools are more aggressive than others. Some schools have extra staff (Gold Bar Recruiters) who can be assigned to just start calling the list. Don't read too much into the fact you received a call, but it's a good sign that at least they know you are out there.
And if you have ever tried to catch an active high school student on the phone you'll know that calling applicants is time consuming.