title: Open whatsapp on iOS with new phone number pre-filled
body: <p>I know there is scheme to communicate with whatsapp like:</p>
  
  <pre><code>NSURL *whatsappURL = [NSURL URLWithString:@"whatsapp://send?text=Hello%2C%20World!"];
  if ([[UIApplication sharedApplication] canOpenURL: whatsappURL]) {
      [[UIApplication sharedApplication] openURL: whatsappURL];
  }
  </code></pre>
  
  <p>But i can't find how to open whatsapp with a phone number that don't exist before.</p>
  
  <p>It's for a "contatc us" page and if i can only open whatsapp and can't pre fill a phone number, it's useless. I need to be contacted with whatsapp...</p>
  
  <p>Does what I am trying to do exist ?</p>