I was wondering about Yellow Pages, too, as I've not seen one of those for ages either. It turns out they stopped publishing last year.
I'm not even listed in the teeny-tiny phone book (2/3 of which is devoted to business listings) - I assume I opted out of something somewhere. Not that there would be any point, given that the landline is never plugged in!
I might try and tear it in half before sticking it in the recycling bin...
With Yellow Pages (and phone books in general) the history is nuts - back in the early 80s the French introduced Minitel which was in many ways the start of the "internet/www" for directory enquiries and over time a host other online functions we take for granted today. The cute little set was offered in exchange for not having a printed directory.
We had Prestel/Videotex/Viewdata BUT there was no "killer app" as the French had (Teletext was a derivative but only one-way)
... and while Minitel was being launched what did we do in the UK? - entered into long-term contracts with a US printer to produce YP (at a factory in the UK) as well as BT phone books and consume masses of Scandinavian hillsides-worth of trees.
I can't recall keeping any YP, BT or Thomson Directory since about 2000 any longer than it took to get it into the recyling bin.