#GrapheneOS only works with #Google #Pixel. This is proprietary AI hardware with access to microphone, camera, location and internet. We don't know what it does, but theoretically it would be possible to route data past the operating system at hardware level (#M2M profiles in #eSIM).

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Sure, it is possible, but that is true for any phone. That question comes up on a regular basis. Despite a lot of close scrutiny, nobody has ever confirmed that Pixel hardware has any backdoors or connectivity that bypasses the OS.
To find out, you would have to be able to read the encrypted 5G radio traffic. And no one has probably managed that yet.
It was not for older phones without eSIM. And I think it's dangerous to believe that you can escape Google's data collection business model with proprietary Google hardware.