My app is using Google\'s C2DM (push notification) to notify users about new activity from friends. Once they install the app I register the device with C2DM servers and sto
I know only one way with server response 200 with "NotRegistered" message in body.
NotRegistered — The registration_id is no longer valid, for example user has uninstalled the application or turned off notifications. Sender should stop sending messages to this device.