In order to get different text, image or hmtl code on a given page, you can use is_page function. Here is a sample way on how you can do create separate telephone numbers on different pages on a WordPress website. (The code below goes anywhere on the page header, footer or any area that can execute a php file.
We are using Page Slugs (URL pattern). You can also use page ID.
Toll Free: 000-000-0000