An anonymous reader shares a Motherboard report: Turning off Bluetooth and Wi-Fi when you're not using them on your smartphone has long been standard, common sense, advice. Unfortunately, with the iPhone's new operating system iOS 11 - which was released to the general public yesterday - turning them off is not as easy as it used to be. Now, when you toggle Bluetooth and Wi-Fi off from the iPhone's Control Center -- the somewhat confusing menu that appears when you swipe up from the bottom of the phone -- it actually doesn't completely turn them off. While that might sound like a bug, that's actually what Apple intended in the new operating system. But security researchers warn that users might not realize this and, as a consequence, could leave Bluetooth and Wi-Fi on without noticing. Numerous Slashdot readers have complained about this "feature" this week.