Clickable phone number

Hi NK,

Another question. How do I create a clickable phone number in a block with a control? I tried several fo the standard options but it does noe seem to work

This is what I put in HTML: Phone: {{phone_poi}}
I tried several options for the control: URL (incl addin .url after control), Text, Textarea, Number but no results until now.

Can you help?

Nicolaas

The page I need help with: [log in to see the link]