It's happened to all of us. We get calls but the caller ID claims that the number is unlisted. This is annoying because it feels as if someone is cheating. Why isn't it listed, we may wonder. You have, after all, paid good money for your caller ID service, and yet there it is, failing you miserably. When a number shows up as unlisted on a caller ID, it is generally not available by any conventional means: you won't find it in the yellow pages, or in the conventional Internet searches. This means that all people have to do is pay a monthly fee to not be listed, and they can then call you for any reason - harassment, prank calls, solicitation - without fear of repercussions. The remedy for this situation is to employ an unlisted phone number look up service.