Many annoying iPhone always-on Wi-Fi and Bluetooth even when the smartphone owner doesn’t use these functions. Particularly acute issue arose after the release of iOS 11, when Apple removed the ability to disable Wi-Fi and Bluetooth from control center. The myth that these technologies negatively affect the battery life of the iPhone really exists. So to answer the main question.


Do I need to turn off Wi-Fi and Bluetooth to save “battery”?


When Wi-Fi is not in active use, the adapter installed in the iPhone, consumes no energy. Its only work when the smartphone is not in sleep mode, scanning the available networks every 15 seconds. However, even in this case consumption is less than 1MW. During feed updates in “Vkontakte” takes more charge.

When using Wi-Fi consumes about 30 mW, but this is not so much. For comparison, during the transmission of data over the cellular network consumption is from 50 to 500 mW. So use Wi-Fi, on the contrary, it is better if we talk about the time of Autonomous work.

As for Bluetooth, this technology also consumes no energy if not connected to another device — regardless of whether this option is enabled in settings or not. Scan for Bluetooth accessories almost does not consume energy, as well as Wi-Fi. But even while working with the same headset adapter “eats” no more than 2.5 mW (the capacity of the battery iPhone X more than 7 000 mW/h, and with other devices — up to 10 mW.

Why leave wifi and Bluetooth enabled?

  • Apple has a database of available Wi-Fi networks around the world. Therefore, even if the smartphone cannot receive GPS signal, it will determine location by Wi-Fi.
  • When connected to AC power and Wi-Fi iOS device will automatically create a backup so that important data is not lost.
  • You have NO reason to turn off Wi-Fi and Bluetooth.

Maybe once Wi-Fi and Bluetooth do negatively affect the battery life of devices, but modern technology to minimize power consumption.