Nearly every modern smartphone is equipped with an accelerometer, which as the name implies, is a sensor that measures acceleration. It’s most commonly used for detecting the device’s orientation. It’s also found many other uses, whether as a game controller in racing games, as a pedometer for counting daily steps, or to detect falls as seen in the Apple Watch. There also have been some research to develop novel accelerometer applications: estimating heart rate, breathing rate, or even as a rudimentary audio recorder using just the accelerometer. Currently, iOS allows any installed app to access accelerometer data without explicit permission from the user. Curious apps might be able to learn a lot about users through the accelerometer and without their knowledge or permission.
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