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  • To limit input on a text field you would use an acf/validate_value filter.

    For formatting the number you need to do that yourself. I would try a search for formatting phone numbers in PHP, here is one example result

    You could potentially use and acf/format_value filter, but this would probably be overkill unless you are using displaying the field in multiple templates, on the other hand if you are using a page builder that is capable of using ACF fields then this filter will probably be needed.