Hi my bf has this phone, I used it a few times and it baffles me!
Its funny about how you close things when you've used them, eg message box, camera, any application really. If you simply press the cancel button or the red button to exit the application, the phone keeps them running in the background and will say you have too many applications running! To get round this you need to make use of the exit option from the menus in the applications instead of taking the quick route pressing the red/cancel button!
Hope that makes sense!
xx