Hi,
You can but the full logic needs to be developed.
The best way without using an API is to create a lookup with the country codes you need to validate with:
- Code (entity identifier)
- Name
- RegularExpression (used to validate the number)
Then create an action that receives the Code and mobile number and apply the regular expression to validate if the phone number is valid.
The biggest problem here is to fill the lookup with all the regular expressions.
Hope it helps,
Ricardo Pisco.