Ok, so I think I might have solved it. Please let me know if this is the best way tho…
$values = get_field('choose_directory');
if($values)
{
echo '<ul>';
foreach($values as $value)
{
$user_db = $value['ID'];
echo '<li>' . $value['display_name'] . '</br>';
the_field('phone_number', 'user_'. $user_db );
echo '</li>';
}
echo '</ul>';
}