add_filter('woocommerce_checkout_fields','change_order_more_fields_classic_checkout');

function change_order_more_fields_classic_checkout($fields) {
	$fields['billing']['billing_phone']['priority'] = 21;
	$fields['billing']['billing_email']['priority'] = 22;
	$fields['billing']['billing_country']['priority'] = 23;
	$fields['billing']['billing_company']['priority'] = 121;
	return $fields;
}