I would like to know how to create a button, symbol, image, to be used as a call feature.
How do you make a button, when pressed, instantly call/dial a specific phone number?
Hey Angelo, at the moment mailto: and tel: links aren’t supported in the editor or prototyping views.
mailto: is supported, only tel: isn’t.
Oh interesting, you’re right. I’ll let the team know we need to update our help article. 
It would be really nice to implement an option to make a phone number link with tel: prefix