Hide the Chat application
Select Menu > Messaging > Chat .
Your sessions remain active for a period of time, according to your service subscription. When the Chat application is running in the background, you can open other applications, and later return to Chat without signing in again.
Receive notifications of new messages when the application is hidden
In the Chat main view, select Options > More > Settings .
Select the desired notification types and Save.
Open the Chat application, and select Options > Exit > Sign out to close the service.
Select Options > Exit > Close to close the Chat application.