If youre using an Android phone thats less than three years old, it could be broadcasting the names of every Wi-Fi network youve connected to. A new investigation from the Electronic Frontier Foundation traced the behavior to a feature called Preferred Network Offload (PNO) introduced with the Honeycomb OS. As part of the phones ongoing search for Wi-Fi connections, PNO periodically blasts out a list of named networks the phone has previously connected to, often while the phone is still in sleep mode. Just go to Advanced Wi-Fi settings and disable the Keep Wi-Fi on during sleep option to stop PNO from checking for networks in sleep mode.
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