Chatrie v. United States · ¶16

Among that information is a single fact most pertinent here: where the user’s cell phone is located at a given time. Apps of many kinds rely on that datum. Your maps app wants to help you navigate from Point A (where you are) to Point B (where you are going). Ride-sharing apps of course track your location when you are using them, and often do so even when you are not. Weather apps want to tell you about local conditions. Fast-food apps want to identify the closest burger and pizza joints. Fitness apps want to track your running routes. And so on.

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