Locating a person via the Wi-Fi data from their Android smartphone relies on a mechanism distinct from traditional GPS. The phone continuously captures signals from surrounding wireless access points, and this information allows for triangulating a position, including indoors. The accuracy, technical limitations, and legal framework of this method deserve detailed analysis.
Wi-Fi Location Accuracy Compared to Other Methods on Android
Three main technologies share the task of geolocation on an Android smartphone: GPS, cell tower antennas (cellular network), and Wi-Fi. Each has very different characteristics depending on the environment.
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| Method | Outdoor Accuracy | Indoor Accuracy | Battery Consumption |
|---|---|---|---|
| GPS (satellites) | Within a few meters | Low or none | High |
| Cellular Network | Variable (better in urban areas) | Approximate | Low |
| Wi-Fi (access point scanning) | Good in dense areas | Good | Moderate |
| Fusion of the three sources | Suitable | Good | Variable |
Wi-Fi location works primarily indoors, where GPS signals do not penetrate. The smartphone identifies nearby networks and compares their identifiers to a database mapping Wi-Fi access points. Google maintains such a database, continuously fed by the Android devices themselves.
A detailed guide on Wi-Fi location on Android Inside outlines the concrete steps to leverage this technique on an Android device.
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Wi-Fi Scanning on Android: What Happens When the Screen is Off
Most users are unaware that their smartphone continues to scan for Wi-Fi networks even when Wi-Fi appears to be turned off. Android includes a feature called background Wi-Fi scanning, distinct from the actual Wi-Fi connection.
This feature allows apps and system services to detect surrounding networks to refine the location. It remains active by default on most devices, including certain Samsung Galaxy, Huawei, or Realme models.
Disabling Background Wi-Fi Scanning
The access path varies depending on manufacturer overlays, but the principle remains the same:
- On stock Android, the setting can be found in Settings > Location > Location Services > Wi-Fi Scanning
- On Huawei smartphones, a specific Wi-Fi and Bluetooth positioning option is accessible in the location settings
- On Realme and OnePlus devices, granular control allows users to permit or deny Wi-Fi network scanning by third-party apps
Disabling this feature reduces indoor location accuracy but significantly limits the passive tracking of the smartphone.
Random MAC Address and Wi-Fi Fingerprinting: The Technical Race
When a smartphone scans Wi-Fi networks, it emits a MAC address (hardware identifier of the network chip). Historically, this address was fixed, allowing for tracking a device from one location to another simply by capturing its Wi-Fi requests.
Recent versions of Android use a random MAC address for each network by default. This measure complicates tracking by third parties but does not eliminate it entirely. Some fingerprinting techniques combine other parameters (signal strength, order of scanned channels, intervals between requests) to identify a device despite randomization.
Android 16-17: Hardening Access to the Local Network
Google is preparing a significant change. Starting with Android 16, a new permission level dedicated to local network access will come into effect, becoming mandatory for apps targeting Android 17. The goal is to block the silent use of local network topology (device discovery via mDNS, Network Service Discovery) for fingerprinting and inter-app tracking purposes.
This evolution directly impacts profiling techniques based on mapping nearby Wi-Fi networks. Applications that exploited this data without explicit consent will need to adapt their functionality or lose access.
Security Recommendations to Limit Passive Location
Cybersecurity agencies like the NSA and CISA recommend disabling Wi-Fi, Bluetooth, and NFC in public places. The reason is twofold: to reduce the risk of location tracking and to avoid automatic connections to malicious networks.
On certain versions of Android, the Wi-Fi chip continues to scan even after the function appears to be disabled. Therefore, ensuring that background scanning is indeed turned off is a distinct step from simply disabling Wi-Fi.
- Turning off Wi-Fi is not enough: Wi-Fi scanning must also be disabled in the location settings
- Google services (Find My Device, Google Maps) use the fusion of GPS + Wi-Fi + cellular network to locate an Android device remotely
- A random MAC address reduces tracking but does not protect against advanced fingerprinting combining multiple radio parameters
The French legal framework, governed by the CNIL, requires consent for any location tracking of a person. Locating a third party without their consent constitutes an offense, even within a family context (except for parental controls regulated by law for minors).
Wi-Fi data location remains a complementary method to GPS, particularly useful in buildings and dense urban areas. The upcoming changes in Android 16 and 17 will restrict silent tracking possibilities, which makes user consent even more central in any location scenario.