My phone field in SharePoint is set to text entry. Here is the Text display Value in PowerApps:
"("&Mid(DataCardValue39.Text,1,1)&Mid(DataCardValue39.Text,2,1)&Mid(DataCardValue39.Text,3,1)&") "&Mid(DataCardValue39.Text,4,1)&Mid(DataCardValue39.Text,5,1)&Mid(DataCardValue39.Text,6,1)&"-"&Mid(DataCardValue39.Text,7,1)&Mid(DataCardValue39.Text,8,1)&Mid(DataCardValue39.Text,9,1)&Mid(DataCardValue39.Text,10,1)&" (Cell)"
This does not control the input mask for the phone field on the form- I am repurposing it on a review/confirmation screen prior to the user submitting the form. Hope this helps in some way.
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