Phone number in header

Is there a way to add a phone number into the header above the social icons without editing the header.php file?

Add this code to Theme Options - Other - Custom CSS and edit code accordingly.

.social:before {
    content: "Your Phone Number Goes here";
    display: block;

make sure to leave quotes in this code.

Thank you very much!

Currently its very simple text. Is there a way i can change the color of the phone no text and make it large and bold?