Change thank you page text for Checkout for WooCommerce.

thank-you-page.php

<?php
// Place in functions.php 
// Do NOT include opening PHP tag (<?php)

add_filter( 'cfw_before_thank_you_customer_information', function() {
    return 'Please ensure your phone and shipping address is correct to ensure timely &amp; accurate delivery.';
} );

add_filter( 'cfw_order_updates_text', function( $order ) {
    return sprintf( 'We'll send a confirmation to %s when your items ship. You will also receive SMS Notification on %s about the delivery status.', $order->get_billing_email(), $order->get_billing_phone() );
} );