title: Custom Dimension - When to send user scope custom dimensions
body: <p>I am currently trying to add a <strong>user scope</strong> customs dimensions to our mobile app(both Android &amp; iOS).</p>
  
  <p>I want to send the Login status, Age, Review Count data of our app member
  so that I can set them up individually as segments.</p>
  
  <p>But I'm not sure when to sent the info. I originally thought to send each custom dimension at 'screenview' but can I send more than 1 custom dimention for every screenview? </p>
  
  <p>Our iOS developer suggested to only send them when the app comes back from to the foreground, but would it work the same as sending them at 'screenview'?</p>
  
  <p>Thanks</p>