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A phone that's off is off. No power supplied to the components, so it can't record anything. It would be trivially easy to find out if it were otherwise, not to mention your battery would get drained.
The phone somehow "seeing through objects" is just straight up fiction. How is that supposed to work?
I saw a video where the phone camera was able to see the naked body of a person through clothes, But I don't remember what kind of phones they were.
That was an AI app that generates a fake naked picture based off an original. Cameras can't do that.
Sony once sold a video camera that could sort of do that under specific circumstances.
Cameras usually have a filter to block infrared light, but that camera offered the ability to toggle the filter to improve the camera's performance in low light. Hobbyists also sometimes modify cameras to remove their infrared filters for artistic effect or to photograph animals at night without disturbing them with visible light. Some clothing is not fully opaque to infrared light, so an IR camera can sometimes capture some detail of what's underneath. Adding a filter that reduces visible light and passes IR might increase the effect.