title: Google Analytics iOS: how does it track users?
body: <p>I am using Google Analytics in an iOS app, without IDFA enabled and without the User ID feature.</p>
  
  <p>The analytics reports refer to new vs returning users, and of course shows other data based on the user's behavior in the app.</p>
  
  <p>My question: How does GA track a user that terminates the app and restarts it? I understand it can't be using UDID to connect the two app sessions, per Apple limitations.</p>
  
  <p>I am trying to understand whether a user that terminates the app and restarts it, or uninstalls the app and re-installs it, will appear in GA as one user or multiple.</p>
  
  <p>Note: I don't need to know anything about the user identity, just their usage of the app.</p>