numbers - virtual keyboards not working

Perhaps to attempt to re-check settings to renew one of the other keyboards

that is original to your iPhone iOS, and then see if that helps make it work?

Add or change keyboards on iPhone - Apple Support

//support.apple.com/guide/iphone/add-or-change-keyboards..

https://duckduckgo.com/?q=how+to+get+numbers+on+iphone+keyboard&t=ftsa&ia=web

iPhone User Guide - (Table of Contents) Apple Support

//support.apple.com/guide/iphone/toc

Had the most recent iOS update/upgrade been applied to your iPhone?

Maybe to arrange an official Apple service visit may be in order.

[There are several other ideas in the user guide contents page.]

..One that comes to mind may be to re-reinstall the iOS..

PS:

Seems your iPhone may have gone on strike or walk-out.

[There's a Numbers User Guide (table of contents) online.]

But that might not be useful if your iPhone has hardware

failures; or may require service appointment to check & see

if there is a hardware problem, behind the lack of usefulness.

Genius Bar Reservation and Apple Support Options - Apple

//www.apple.com/retail/geniusbar/

Various options to help determine what may be acting up with

an Apple device; a missed security update, might be a cause.

This reply was difficult to compose, maybe the site or my Mac

browser could be lagging; anyway, the previous one timed-out.