When creating a QT player widget and starting a video stream, the player is opening a brand new network connexion (even if the application already has a 3G/WiFi connexion open).
If no other connexions are available, the stream fails to open.

In Symbian, you can force the player to use the same access point as the application (and reduce the total number of AP used to 1), but we never managed to do it in QT.