As we noted back in September, iOS 11's Control Center buttons don't actually turn off Bluetooth or WiFi, unlike previous versions. Instead, tapping on either one simply disconnects you from any devices or services your iPhone is currently connected to. Apple ostensibly made this change so that you could stay connected to other services like AirDrop and devices like your Apple Watch. Still, the behavior can be confusing to many. According to MacRumors, the latest iOS 11.2 beta gives you an explanatory notification when you tap either Control Center button.