[JPLeRouzic]

A phone has several levels of software and hardware, the OS that the user knows is not in charge of communications, its main role is to interface the user to the computer inside the phone. The phone OS sees the phone communication hardware akin to the way it sees an Ethernet card. The phone communication hardware (named baseband modem) is also under control of the SIM and every time the mobile operator wants to change the behavior of the baseband modem it can through the Sim toolkit.

[akimbostrawman]

sadly firmware is a bitch on almost any modern device. good thing it can more or less be isolated from the OS

https://grapheneos.org/faq#baseband-isolation

[aucisson_masque]

Believing the software can somehow be separated from the hardware is a lie. They can mitigate at best the the amount of information one can extract but at the end whoever control the hardware can have access to extremely private information.

A gyroscope sensor is able to accurately record what one say close to his phone. It doesn’t even need Android to run he has access to private information.

https://crypto.stanford.edu/gyrophone/files/gyromic.pdf