Creating a format restriction for a phone number

A 'Text' Restriction that 'Contains' a dash.  This allows for phone number format, as well as international numbers.  It also allows for input containing any amounts of dashes, and/or alphanumeric characters when specific sequencing is desired.  However, formatting is not enforced, and it also DOES NOT force a user to input a phone number nor restricts from inputting more nor less characters than the form author desires.  For best practice, add a format instruction and example to the 'Section' title or subtitle. (i.e. Format: 301-225-0000)

Microsoft Forms stinks in this regard; however, my best practice is to require only numbers in the field and limit entry between 2000000000 and 9999999999.

When you download your results into Excel, convert the fields to numbers (because for some reason the results download as text) and then format the cells using the "special" option for a phone number to generate data such as (201) 555-1212, etc.