Dell - Disable bluetooth also disable also wifi

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http://askubuntu.com – I would like to disable bluetooth ( I don't use it so much ) but using Jupiter or disabling it using Bluetooth applet it disable also wifi. I tried removing the bt modules: sudo modprobe -r btusb ; sudo modprobe -r bluetooth ; sudo modprobe -r dell_laptop but I'm not sure it is real disabled ( I want to save battery) Currently I'm on Ubuntu 12.04 64bit and my pc is a Dell Inspiron 14z (HowTos)