title: Prompt when trying to dial a phone number using tel:// scheme on iOS 11
body: <p>I am facing an issue, while trying to start a phone call from my iOS app using:</p>
  
  <p><code>UIApplication open(_:options: completionHandler:)</code> </p>
  
  <p>iOS shows an confirmation popup/alert before starting the call with two button Call &amp; Cancel and CompletionHandler called with a Bool parameter having true/false based on button action in iOS 10. </p>
  
  <p>But now in iOS11 the problem is that the completionHandler is being called automatically before tapping on "Cancel" or "Call" button of confirmation popup, always having true value.</p>
  
  <p>Is this a bug in iOS11 or is there something that I am doing wrong?</p>