Saw this number as a missed call.  Tried to call it back, but it wouldn't go through

same happened to me, who is this person? scamer? or what?

Unknown number. Repeatedly calls but leaves no message.

I get a lot of collection agency calls, so I bet that's it. I tried to call it back, but it wouldn't go through.

saw this number on a missed call, also had no message left- think it's the first time i've seen this number, unlike other unwarranted and unwanted numbers that call repeatedly and often.