In Page Item definition you have a section "Settings", here you can set "Subtype". Choose Phone number.
The subtype-option is only available for Text Field items.
Thanks for the quick response! I found the Settings and subtype but when I set to phone it does not make the phone # dial-able on touch.
In a report I can set : Column Formatting --> HTML expression to:
The phone # will then dial out when touched on smartphone. List view does not seem to allow formatting the column with such a format. Seems strange that Jquery mobile would not have this type of formatting 'built in' so any subtype defined as phone would automatically be dialed on touch.
In a listview,, under region attributes, you can check the option "Advanced formatting". Then, under "Text formatting", enter your HTML expression, but use the &. substitution: