WiFi sniffing to locate viable networks can be legitimately used for activities like searching an unfamiliar urban area for a wireless hotspot. This can be done with an electronic device or with software; the same device can be used to detect and steal WiFi from a homeowner who has it activated in their home. When used with ill intent from a moving vehicle, this practice is sometimes referred to as wardriving. Apple removed all WiFi sniffing software from its App Store in March of 2010, but the iPhone has a built-in WiFi scanning feature to locate wireless hotspots.
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