To avoid being tracked: There are services that track your location by detecting your Wi-Fi address (MAC address).To protect against hackers: There are no known hacks that use Wi-Fi with iOS devices running current versions of iOS, so this is not a valid reason to turn off Wi-Fi.What are other reasons that some users turn off Wi-Fi? Some Bluetooth devices require higher power the most will be 10 mw, but that still means that if your battery life isn't what you think it should be, the problem is not Bluetooth or Wi-Fi. As the battery capacity of an iPhone 8 (not plus) is about 6900 mwh, if Bluetooth was the only thing using power the battery would run down in about 2800 hours, or about 3 months. When Bluetooth has an active paired connection to a hands-free device it consumes 2.5 mw.While it listens for Bluetooth devices, it uses no measurable energy to do so, as with Wi-Fi. And you are clearly using it when it is connected, so you don't want to turn it off then, either. Bluetooth uses no energy unless it is connected to a device.But mobile data uses from 50 to to 500 mw depending on signal strength when using data or voice, so Wi-Fi is always the better choice if you are actively using the phone. When WiFi is connected it uses 30 mw continuously, whether transferring data or not.Yes, it scans for networks every 15 seconds when the phone is not asleep, but that's just a receiver, and uses no measurable power (less than 1 mw). So turning it off is redundant.If WiFi is not actively being used it uses no power. Wi-Fi is off when an iPhone or iPad is asleep, unless plugged in.Some real facts (for iOS, although similar for other manufacturer's devices): It isn't true, and there is no reason to turn either off, and several good reasons to leave them on all the time. As a result, a lot of people turn off Wi-Fi and/or Bluetooth to "save battery life." This is the result of some self-appointed guru in the trade press years ago saying that Wi-Fi and Bluetooth are energy hogs. There is a myth that Wi-Fi and Bluetooth on iOS devices (and other manufacturer's smartphones) drain your battery.
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