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iPhone gyroscopes, of all things, can uniquely ID handsets on anything earlier than iOS 12.2

Baldrickk Silver badge

It may take a little longer to get the fingerprint, but nearly everyone will put their phone down somewhere at some point.

If the app taking the fingerprint were to just wait for a period with no gross jitters on the sensors, then you could assume that it's stationary and fingerprint it then, without having to try and account for gait etc.

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