title: Call phone action don't work in swift
body: <p>Hello I've button action for call number , but when I used it don't call and nothing shows. </p>
  
  <p>My codes under below.</p>
  
  <pre><code>  @IBAction func callPhone(sender: AnyObject) {
          UIApplication.shared().canOpenURL((NSURL(string: "tel://1234567890")! as URL))
      }
  </code></pre>
  
  <p>Thank You !</p>