A feature built into iOS is constantly tracking your movements and storing a detailed history of places you visit on a regular basis on your iPhone.
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The feature, called Significant Locations, is described by Apple as follows:
Allows your iPhone to learn places significant to you in order to provide useful location-related information in Maps, Calendar, Photos, and more. Significant Locations are encrypted and cannot be read by Apple.
For some, this is going to be no big deal. For others, this will be seen as…