Caller ID indicated UNKNOWN CALLER.  It was a number I did not recognize so I did not pick up.  No message left.  If they don't leave a message, it's normally some kind of "ruse".

Left no message, caller ID reads Beecher IL, CALLED NUMBER BACK, message allows adding my number to their do not call list

Back brace scam

Thank you for the information

1)  Unknown CID.  2)  No VM.  3)  BLOCKED.