It is the distant future…the year 2010. Phone books are obsolete. You can tell the yellow book companies you don’t want to receive them. For your local instructions, use this page.
The one for Dex is a bit confusing. Here’s how you do that one: Go to this page. Enter zip code. Enter address and select zero on each type of phone book.
http://www.ypassociation.org/AM/Template.cfm?Section=Environmental1&Template=/CustomSource/ZipSearch.cfm