title: How to open Whatsapp with a specific phone number from a Xamarin Forms iOS app?
body: <p>I need to know how can I open WhatsApp from my app to a specific number. For Android, the following is working fine but I don't know if it works with iOS. Here is my code for Android:</p>
  
  <pre><code>try
  {
      Device.OpenUri(new Uri("whatsapp://send?phone=+678115361041"));
  }
  catch (Exception ex)
  {
      await DisplayAlert("Not Installed", "Whatsapp Not Installed", "ok");
      await DisplayAlert("", ex.Message, "ok");
  }
  </code></pre>