Add a call to order button to the single product page

functions.php

<?php
function patricks_woocommerce_call_to_order_text() {
	echo '<p>Call to order this product. <strong>123-456-7890</strong>.</p>';
}
add_action('woocommerce_single_product_summary','patricks_woocommerce_call_to_order_text', 30);