Hi,

There are a couple of options.

1. You can have the phone number in the header widget area. This will be visible on all pages unless you manually disable it on a specific page. https://dentalia.orionthemes.com/documentation/theme-options/header/

2. You can enable the top bar in theme options. This will create an additional widget area allowing you to add a widget with the phone number. https://dentalia.orionthemes.com/documentation/theme-options/header/top-bar/

3. You can add a CTA button in theme options. It will be visible on all pages. https://dentalia.orionthemes.com/documentation/theme-options/navigation-settings/cta-button/

I hope this helps.

Timea