For missing or unverified numbers, Telmex does not offer an alternative lookup. You cannot "force" a private listing to appear.

He flipped to page 412. There, next to a name smudged by forty years of humidity, was a small, hand-drawn blue telephone—the secret "verified" stamp of the old-guard technicians. Underneath, in faint pencil, was a set of coordinates.

WhatsApp uses mobile numbers, which are not in the White Pages.