Where I work, there's a ton of phone numbers, and they're all private (unlisted). They dumped the "switchboard" operator awhile ago... now you need to know the specific office you're calling... call an empty one (twilight management has its own office) and it just rights... call the wrong number, they won't bother to help. And no matter where you call from, it'll display the same incoming number on caller IDs that when you go to call back it'll say 'This is an outbound call center only.'