You can control general settings like Bluetooth, WiFi, and Airplane mode by hopping into the Settings app on your iPhone or iPad, or through Control Center. But why if you can just ask Siri to enable or disable a setting for you? Here's how:
That's all there is to it! Currently you can ask Siri to control Airplane Mode, Do Not Disturb, WiFi, Bluetooth, Rotation Lock, screen brightness, and volume. You can also of course ask Siri to launch any app you have installed too.