This articicle explains how to add phone icon link on your mobile like this:

Add following code at the end /wp-content/themes/myhome-child/functions.php
add_filter('myhome/menu/mobile/logo', function() {
$logo = '';
$estate_slider = My_Home_Theme()->settings->get( 'estate_slider' );
if ( is_singular( 'estate' ) && $estate_slider == 'single-estate-slider' ) {
$logo = My_Home_Theme()->settings->get( 'logo-dark', 'url' );
$logo_when = My_Home_Theme()->settings->get( 'logo', 'url' );
} elseif ( is_page() ) {
global $post;
$image = get_post_meta( $post->ID, 'page_header', true );
if ( $image == 'mh-header--transparent mh-header--transparent-dark' ) {
$logo = My_Home_Theme()->settings->get( 'logo-dark', 'url' );
$logo_when = My_Home_Theme()->settings->get( 'logo', 'url' );
} elseif ( $image == 'mh-header--transparent' ) {
$logo = My_Home_Theme()->settings->get( 'logo-dark', 'url' );
$logo_when = My_Home_Theme()->settings->get( 'logo', 'url' );
}
}
if ( empty( $logo ) ) {
$logo = My_Home_Theme()->settings->get( 'logo', 'url' );
}
$homepage_url = apply_filters( 'wpml_home_url', home_url() );
ob_start();
?>
<span class="nav_logo">
<a class="mobile_toggle">
<span class="mobile_button">
<style>
.top-phone {
display: none;
position: absolute;
z-index: 999999;
top: 18px;
right: 54px
}
.top-phone i {
color: orange;
font-size: 24px;
}
@media (max-width: 1023px) {
.top-phone {
display: inline-block;
}
}
</style>
<span class="symbol_menu"><i class="fas fa-bars"></i></span>
<span class="symbol_cross"><i class="fas fa-times"></i></span>
</span>
</a>
<a href="tel:123" class="top-phone"><i aria-hidden="true" class="fa fa-phone"></i></a>
<?php if ( ! empty( $logo ) ) : ?>
<a class="logo_link" href="<?php echo esc_url( $homepage_url ); ?>"
title="<?php echo esc_attr( get_bloginfo( 'name' ) ); ?>">
<img
src="<?php echo esc_url( $logo ); ?>"
data-logo="<?php echo esc_url( $logo ); ?>"
<?php if ( ! empty( $logo_when ) ) : ?>
data-logo-switch="<?php echo esc_url( $logo_when ); ?>"
<?php endif; ?>
alt="<?php echo esc_attr( get_bloginfo( 'name' ) ); ?>"
>
</a>
<?php endif; ?>
</span>
<?php
return ob_get_clean();
});