That's why (or one of the reasons) I use Tasker to turn off wi-fi when I leave home.
The flip side of this is, if you leave wi-fi on, your phone identifying itself to access points so they can use your address to track how often you go past, etc like the bins that tracked your location http://www.telegraph.co.uk/technology/news/10237811/Bins-that-track-mobiles-banned-by-City-of-London-Corporation.html (although they have been put on hold for the moment).
@aggi started
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That's why (or one of the reasons) I use Tasker to turn off wi-fi when I leave home.
The flip side of this is, if you leave wi-fi on, your phone identifying itself to access points so they can use your address to track how often you go past, etc like the bins that tracked your location http://www.telegraph.co.uk/technology/news/10237811/Bins-that-track-mobiles-banned-by-City-of-London-Corporation.html (although they have been put on hold for the moment).