Who called from 8503783957

Got a call from this number, and didn't answer it in time.  Then when I tried to call back, it came back as a "non-working number"??  That is just strange.

Got a call, it was a recording about life insurance... I hung up.

Rang twice, I answered, no response. I will block.

Just got a call from this number and nothing but silence for a few seconds after I answered, then the call disconnected. I answered on the 2nd or 3rd ring.