Even when you explicitly turn off the main Wi-Fi toggle in your Android phone’s quick settings panel, your phone continues to secretly hunt for wireless networks. This is due to a feature called “Wi-Fi Scanning,” which allows Google Location Services and third-party apps to continuously scan for nearby routers in the background to improve location accuracy without relying exclusively on the power-hungry GPS chip.
While this improves location precision in dense urban areas, it is a significant drain on your battery. Your phone’s radio antenna is essentially firing up every few minutes to catalog every SSID in your immediate vicinity. Furthermore, from a privacy standpoint, you may not want your device constantly logging the MAC addresses of every router you walk past.
You can force your Android phone to completely shut down the Wi-Fi radio when the main toggle is turned off.
How to Disable Background Wi-Fi Scanning
This setting is buried within the Location privacy menu.
- Open the Settings app on your Android device.
- Scroll down and tap on Location (on some devices, you may need to tap Security & Location).
- Tap on Location services (or Wi-Fi and Bluetooth scanning on older Samsung devices).
- Tap on Wi-Fi scanning.
- Turn the toggle switch to the Off position.
- (Optional) While you are on this screen, you should also tap on Bluetooth scanning and turn it Off to prevent apps from silently scanning for nearby Bluetooth beacons.
With this feature disabled, when you turn off Wi-Fi, the antenna actually turns off. It will no longer ping surrounding networks in the background, saving your battery life and increasing your privacy.