My iPhone does not have the app store

If you're talking about th AppStore icon, make sure that it hasn't been moved to a differnt screen page or "hidden" into a folder. If you stiil can't find it, check:

Settings>ScreenTime>Content&Privacy Restrictions>iTunes&AppStore Purchases... the first 3 options must be set to "Allow". When done, restart your iPhone.

Regards

Giulio