Make Phone Nos in Icon Box Element Clickable on Mobile

Okay, I don’t know if this is possible, I usually make phone numbers clickable on mobile using html code like this:
940-759-4736

and I have done this within your iconbox element – but it doesn’t work – tried a couple of different ways. I love the look of this, so hate to change to a text box, but client really wants them clickable. Do you have an answer to this?

Site is here – I have these icon boxes at the bottom of every page above footer: https://muensterdentist.com/

Screenshot Here: https://muensterdentist.com/wp-content/uploads/2018/10/Home-Smiles-by-German-Design.png

I’ve tried a couple of plugins too, no luck.

Thank you for giving this some thought!

~e