How to create a Hyperlink using MYSQL data to be passed into a url

Hi Experts,

What im trying to do is

Make some data from mysql into a hyperlink so when the hyperlink is pressed sends the hyperlink for example "0777777777" into the array and would then direct onto the next page.

so the url once the link is clicked would be something like

http://localhost/billing.php?val=07777777777
how would i make the 077777777 retrieved from the database into a link which sets as a variable?
this is what ive got so far. see attached

Many thanks for your help

<?php 
error_reporting(E_ALL);
include 'myphp.php';
$val = $_GET['val'];
$sql = "SELECT * FROM customer_details WHERE customer_name = '" . $val . "'";
$result = mysql_query($sql) or die(mysql_error() . " IN $sql"); 
$rs = mysql_query($sql);

while($row = mysql_fetch_array($rs))
{
   echo"<table>";
   echo "<tr><td>Customer:</td><td>".$row['customer_name']."</td></tr>";
   echo "<tr><td>Mobile Number:</td><td>".$row['mobile_number']."</td></tr>";
   echo"</table>";
}
   ?>