Hm. As usual this past couple of months - Unknown Call with this number (one of a score or more) who calls but refuses to leave a message.  Got news for 'em - as I know a lot of 'em read these posts - no name, I don't know the number, I DO NOT ANSWER.  No message? No call back.  Your number is blocked.  Which probably doesn't really matter as it's probably not a valid number anyway.