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The gyro & accelerometer in a phone can also gauge relative height, from the force and velocity picked up by the accelerometer. They’ll know from the logs of that data when the phone moved downwards as N sat on the bench with it in her hand, and then when it moved downwards again when she placed it on the bench. I think their confidence in stating “on the bench” comes from a combination of that plus also being able to tell from the gyro & accelerometer data that the phone didn’t move between 9:20 and the moment it was picked up from the bench at 9:33 by the woman who found it.
A gyro and accelerometer measures orientation, rotation and acceleration relative to gravity. They do not provide altitude. Thus it can tell when a phone moves and when it stops. It can’t tell you if a phone is on bench but it could tell you which way the phone was oriented. That’s if the model has these capabilities which we don’t know. And as I keep repeating mobile phone location data is not that accurate on location.
If I went missing my last known location would be my neighbour’s flat to which I have never been as they live abroad.
The police don’t ‘have confidence’ in stating on the bench - as they say on, at and in the area of the bench interchangeably.
We don’t even know who picked up the phone, one report says it was a woman the other says it was a male walker who found it on the ground.