Experimental telephone numbers

screenshot of the "Ask users for Telephone number" design pattern on the GOV.UK Design System. Below the title of the pattern, there is a tag that is labelled 'experimental', and a text that reads: This pattern is currently experimental because more research is needed to validate

example of the “Asking users for Telephone numbers” design pattern on GOV.UK Design System and the use of an “experimental” tag to indicate its development status.