Generally that is what shows if the caller ID is blocked on the caller's end - they block their number from showing up. It would come to your phone as an unavailable number or restricted number.
bovine2, We can understand the importance of tracking call details. If you are logged in to your My Verizon account and you see the number is all 9's,0's etc the number has been restricted by the originating party. Are you only seeing this number for incoming calls?
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When I got that it was someone from overseas calling. (Turned out to be my husband's girlfriend when he was over there working.) I have gotten it on my landline to and it was usually someone trying to sell me something. Don't answer it. If it is important they will leave a message