Basically as long as you have WIFI turned on, your phone will recognize WIFI networks in the area. Even if you do not connect to any WIFI networks, those networks can see your phone and just like your phone can recognize a network is in the area... But these networks will record your MAC address and can then determine your position in the store, watch where you are going and know everything you are looking at as long as you are within range of it.
Turn your WIFI off when you are not using it.
Source: Lifehacker
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