With IM (network service), you can exchange instant messages with your friends. You can access several chat services or communities simultaneously and switch between them. If you want to, for example, browse the web, you can leave the IM application to run in the background, and still be notified of new instant messages.
The IM application is preinstalled on your device. To start chatting, select Menu > Internet > Chat.
Using network services and downloading content to your device may result in data traffic costs.