@cjcjcreativedesign-com : WordPress allows Dashicons only for the back-end or for registered admins. It cannot be used in the front-end of your site. Its mentioned in the following link that Dashicons is the official icon font of the WordPress admin as of 3.8.
You can make use of genericons available in the theme. You can add the following code to display a phone icon on your post and pages. <span class="genericon-phone genericon" style="font-size:30px"></span>
Note: You may change the font size of the icon as desired. Let me know if this resolves your issue.
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