How to make the clickable phone number on the website
You need to know one little secret to make call-able phone number on any site. The secret is that a clickable phone number is a link that starts with tel:
That’s it. Knowing this, you will now be able to insert a clickable phone number into the site yourself.
HTML:
<a href="tel:0999999">0999999</a>
And if you are using some kind of constructor or CMS (for example, WordPress), then you just need to insert this code in the “link” field
tel:0999999
And as the link text (anchor) write your standard (without tel:) phone number.
For example, as you can do in WordPress.
Go to Appearance -> Menu.
Add “Custom link”. And in the URL field you must write tel:XXX, and in the Navigation Label field – the standard phone number XXX.

If you still have any questions, feel free to write them in the comments to this article.