About a few days back, I got a phone call from UNC - Can’t remember if it was just an alumni or admissions calling cause I was a bit busy at the time - asking if I had any questions about the college. Just wanted to know if they were calling everybody or does this mean anything special at all?
Are you instate or OOS?
In state
I am not familiar with these phone calls, but that doesn’t necessarily mean anything. Are you from an underrepresented part of the state?
From Wake County which isn’t underrepresented at all
I don’t know of any students who received phone calls. Good luck to you!
I got that same call yesterday while I was at work. I’m from a very underrepresented county (Rutherford) in-state. I asked my mentor and she said that it was a very good sign. I don’t know your stats but they obviously don’t call everyone! They must see something special in our applications 
My son has not received a call from UNC, but he has received calls like that from 5 or 6 other schools. I don’t think it means much. The schools ran the gamut from safties to matches to total reaches, including public and private universities. I think it’s something some schools do sometimes.
He’s also received emails from current students, who I assume are working in Admissions office. Some out of state schools have had students from our state email my son to tell him how they dealt with the switch from NC to Boston or Chicago or wherever. My son liked those personal messages, but I don’t think the AOs have targeted him for any special admissions considerations.