If you add a location module and fill in the address and phone number, you can have both of these items appear on the Home Page by checking the "Display on Home Page" box underneath the title, and above the GPS options.
Since multiple locations can't be shown on the Home Page, there are other ways to include a click-to-call phone number.
Option 1: Add a Click-to-Call button (or text) using the Custom Header or Alternate Home Page header. If you want the phone number to only appear on the home page, use Alternate Home Page header. If you want the phone number on every page, use the Custom Header.
Option 2: Create an External Link module titled "Call Us", "Contact Us, "Get in touch" etc. and make the URL the phone number formatted like this: "tel:800.555.1212"
*This will only show up on the Home Page in the menu bars, for a phone number that shows on every page, use Option 1.