Make the phone number not required in WooCommerce checkout

gistfile1.php

<?php

add_filter( 'woocommerce_billing_fields', 'wc_npr_filter_phone', 10, 1 );

function wc_npr_filter_phone( $address_fields ) {
	$address_fields['billing_phone']['required'] = false;
	return $address_fields;
}

?>

Exactly what is was looking for! thank you