As I noted in two previous posts, it was recently revealed that there's a log file on your iPhone that records everyplace you go. It created a bit of a stir, even though it was evident that that information wasn't being transmitted to Apple or to any other entity. Members of Congress even questioned Apple about it. Apple today posted a Q&A that explains what this log file is, and says that in fact it's not tracking your location. Rather, it's maintaining a record of nearby Wi-Fi hotspots and cell phone towers, some of which can be as distant as 100 miles, in order to be able to quickly and accurately respond when an app requests location data.
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