I have an application, which lists number of IM sent by any of my friend using my application. And application icon show number of unread IMs to me. If my application is running in foreground, I can update badge by calling web service every 1 minute which will return number of unread IMs. Suppose, if the person is using iPhone3.0 and application is not running, how can i update the badge? Push notification without alert, but with just number of unread IMs as badge number will work? 

Please advice, Thank you.