title: Why Locale.current.regionCode is nil?
body: <p>I am trying to get user's region code in swift 3 by using:</p>
  
  <pre><code>Locale.current.regionCode
  </code></pre>
  
  <p>Unfortunately regionCode is nil, do you have an idea why?
  And what should I do to obtain it?</p>
  
  <p>Thanks a lot.</p>