changeable phone num

<?php
//
$frontpage_id = get_option('page_on_front');
$phone = get_post_meta($frontpage_id, 'phone', true);
$local_phone_number = get_post_meta($post->ID, 'phone', true);
if (!isset( $_COOKIE["PhoneNumber"] )) {

	if ($local_phone_number != null) {

		$phone_number = $local_phone_number;

		//1 day

		setcookie('PhoneNumber', $local_phone_number, time()+60*60*24,'/');



	} else {

		echo $phone_number = $phone;

		//1 day

		setcookie('PhoneNumber', $phone_number, time()+60*60*24,'/');

	}

} else {

	$phone_number = $_COOKIE["PhoneNumber"];

}


?>

<?php 

//to show phone num

echo $phone_number;