Clickable phone number

Hello !!
I would like to add a phone number in the thank you screen of my survey, in case people want to contact us. But I don’t find the way to make this phone number clickable.

I would like the respondent to be able to click on the phone number, and so, if he is using his cellphone to answer the survey, he just has to click on the number and it automatically dials.

Do you know how to do this ?

Thank you for your answer!

Sophie