You can display contact number on the top header section. Your visitor can find and contact quickly. You can add further information using Appearance Customize. Now I will explain to you how to add details. Refer the screenshot.

1. How to add contact details?

Go to => WP-Menu => Widgets => 

Here you can find a widget by named “WBR: Header Widget” and this widget into top “header right widget area” section. After the drag, you will see widget settings like an icon, title, and description. Refer the screenshot.