title: iOS push notifications - how to deal with device ID?
body: <p>What is most commonly used strategy?
  I'm trying now to implement following:</p>
  
  <p>On application start:</p>
  
  <ul>
  <li>Get previously saved device Id from some local storage  </li>
  <li>Get device Id </li>
  <li>If changed, save new Id, send update to server</li>
  </ul>
  
  <p>Is this right approach?
  What is the best way to store device Id locally?</p>