title: Symfony doesn't validate on iphone
body: <p>I have set an entity with this code</p>
  
  <pre><code>/**
   * @Assert\Length(
   *      min = 20,
   *      max = 2000,
   *      minMessage = "message.min_length",
   *      maxMessage = "message.max_length"
   * )
   */
  protected $message;
  </code></pre>
  
  <p>When I'm using a desktop navigator it refuses to send when the message is less than 20, but when on iphone or tablet (android) the message is sent, even empty. The field is a textarea.
  Any ideas ?</p>