At "Default Country", fill out the abbreviation of the country you want to use by default. For example, "NL" for "Netherlands" or "US" for "United States". Do the same for "Phone Format". Record Validation needs this information to validate the phone number in the right country and the right format.
Optionally, fill out the other fields with variables or fixed values, or leave them blank.
Example of the Validate Phone Flow Component
Step 3 Connect your screen to the Start trigger
Make sure the screen is connected to the Start trigger.
Step 4 Run the flow
Save the flow, give it a name and click "Run".
Fill out the phone number and Record Validation will validate it for you.