Hello @bjvca,
This should be possible. using hyperlink feature with [link label](link address) where the link address is the phone number you wanna call (could be a link from another field in the form too) built using calculate field to bind "tel:{number}" with form field that holds the number. The same method could be used to send email using "mailto:{email}"
I edited a form (url.xlsx (11.3 KB)) once shared by @yanokwa in this thread to match your request.
Hoping this helps.
Happy ODKing
Jules R