title: How to make phone call in iOS 10 using Swift?
body: <p>I want my app to be able to call a certain number when a button is clicked. I've tried to google it but there doesn't seem to have one for iOS 10 so far (where openURL is gone). Can someone put an example for me on how to do so? For instance like: </p>
  
  <pre><code>@IBAction func callPoliceButton(_ sender: UIButton) {
      // Call the local Police department
  }
  </code></pre>