Using Font Awesome in WordPress. http://sridharkatakam.com/using-font-awesome-wordpress/

functions.php

// Load Font Awesome
add_action( 'wp_enqueue_scripts', 'enqueue_font_awesome' );
function enqueue_font_awesome() {

	wp_enqueue_style( 'font-awesome', '//maxcdn.bootstrapcdn.com/font-awesome/latest/css/font-awesome.min.css' );

}

gistfile1.html

<i class="fa fa-phone"></i> +91 1234567890

gistfile2.css

.fa-phone {
	font-size: 25px;
	vertical-align: middle;
	padding-right: 5px;
}

gistfile3.css

.menu-primary li a:before {
	font-family: FontAwesome;
	padding-right: 7px;
	/*font-style: normal;
	font-weight: normal;
	text-decoration: inherit;*/
}

/* Home menu item */
#menu-item-1616 a:before {
	content: "\f015";
}

/* Pages menu item */
#menu-item-1413 a:before {
	content: "\f0e8";
}

/* Categories menu item */
#menu-item-1414 a:before {
	content: "\f15b";
}

gistfile4.css

#meta-3 .widget-title:before {
	font-family: FontAwesome;
	padding-right: 7px;
	content: "\f05a";
	font-style: normal;
	font-weight: normal;
	text-decoration: inherit;
}