I have received a call about every other day for the past three weeks. Sometimes two or three times a day. When I answer it sounds dead. When I call back it rings once then sounds dead. Maybe it is a hack for smart phones? Glad I don't have one.
Keeps calling and hanging up. Annoying for a short bit, ultimately took me less than five minutes to block that number from ever calling again. Hopefully they die of a diarrhea.