<?php $phone = get_theme_mod( 'phone_number', '+1 899-777-5555' ); ?>

<?php if ( ! empty( $phone ) ) : ?>
	<div id="phone-number">
		<?php $text  = get_theme_mod( 'call_text', __( 'Call Us:', 'losatom' ) ); ?>
		<?php echo esc_attr( $text ); ?>
		<span><a href="tel:<?php echo esc_attr( $phone ); ?>"><?php echo esc_attr( $phone ); ?></a></span>
	</div>
<?php endif; ?>