Called my home number. No message.

This number has called my home multiple times.  Answered just now and they would not say anything.  I tried to block the number and received a message that it was an "invalid number".

That is because no exchange or area code in the North American Calling Plan numbering system can begin with a "0" or "1". Those numbers are reserved for special functions although if universal 10 digit dialing becomes a reality then the second triplet could begin with a "0" or "1" at that time.