To see what apps you have open, from your home screen hold down the alt key and press and release the back key to the right of your trackball. You can then scroll side to side to see what is open. Then close each one. You cannot however close home, browser, messages, PTT, phone or BB messenger. When you are done using an app just hitting the red hang up key doesn't close the app it keeps it running in the background. All apps have a close or exit option available by clicking the menu key. Use that for best performance. If the camera still won't open after closing everything pull the battery out of the phone while it is on. Leave it out for 30 seconds and replace. Allow the phone 1-3 minutes to reboot. Then try the camera again. Let us know if that works. For the bluetooth, have you successfully paired it to your device yet?