I assume these to be prank calls or some kind of scam. The caller id simply reads “New York” and it appears to be a cell phone but on occasions when I tried calling the number back I heard a recording saying the number “wasn’t in service.” No messages have ever been left and no one has ever been on the other end of the line. It’s literally like being called by a ghost or a robot. It really just seems like the “purpose” if there is one is to cause annoyance and perhaps fear.