title: Can't make phone calls to numbers with asterisk
body: <p>I'm trying to make a phonecall from the app, nevertheless the number have an * ... So it doesn't work. If I delete the *, it works just well, but not as intented.</p>
  
  <pre><code>    let phoneNumber = "tel://*000000"
  
      if let url = NSURL(string: phoneNumber) {
          UIApplication.sharedApplication().openURL(url)
      }
  </code></pre>
  
  <p>Any idea?
  Thanks in advance!</p>