Hello Justin,
Thanks for asking.
It will require some custom development work which falls outside the scope of support we can offer. However, I can share some pointers that will help you get started.
I see that you have already installed child theme. First, copy _nav-primary.php from /wp-content/themes/x/framework/legacy/cranium/headers/views/global/ under /wp-content/themes/x-child/framework/legacy/cranium/headers/views/global/. You will have to create the necessary child folders in child theme. After that you can add the Phone Icon code after line number 16 that ends with:
<span class="visually-hidden"><?php _e( 'Navigation', '__x__' ); ?></span>
</a>
Please make sure topbar is activated under X > Theme Options > Header > Miscellaneous. If social icons was added in menu items then please take a look at solution mentioned in following thread.
Thanks.