Who called from 2018459998

Just got a call from this # 2018459998, no idea who it was, no message left either

I received calls from this # twice today. No answer, no message left either. I tried call back, it was busy all time.
Very strange.

This number has called my cell phone numerous times during the last few weeks and every time I call back (since I won't answer calls from numbers that I don't recognize) it says, "The number you dialed is not in service".

This number has called my cell phone 5 times today and when I call it back it says the number you are trying to reach is an invalid number

I just received a call from the 201 #...i was walking to my cell to answer, but just missed the call. I was oddly curious (i never am about unknown numbers), therefore I called back literally 10 seconds after the missed call..."this number has been disconnected".... Wtf? Now I'm extremely curious!