title: Android phone won't receive SNS push notifications
body: <p>I have a few Android phones.  I'm pushing messages to them via Amazon SNS to GCM, using boto in Python.  One phone always receives the messages.  The other one does not.</p>
  
  <p>The first time I send a message to the problem phone, it appears to succeed but nothing goes through.  When I go to the AWS console and look at the list of endpoints registered to my app, it now shows "false" under the Enabled column.</p>
  
  <p>The second time I send a message, boto raises an exception with a message in it: "Endpoint is Disabled"</p>
  
  <p>What are some reasons why an android phone would not receive GCM messages?  Are there user settings that can disable this?</p>