As for 'unknown' callers who withhold their numbers - I don't answer the phone to them! If it's important, they leave a message - and only then I call them back. If they don't - tough!

Well I have to say as the company collector when someone drops off the face of the earth and doesn't return calls my favorite tactic is to take one of the driver's cell phones with a blocked number and lo and behold I get someone to answer the phone. I _just love_ hearing their drawers drop on the other end of the line. A girl's gotta do what a girl's gotta do to get paid.As for 'unknown' callers who withhold their numbers - I don't answer the phone to them! If it's important, they leave a message - and only then I call them back. If they don't - tough!