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A comment on US cell carriers are selling access to real-time phone location data. Parent comment

Re:US cell carriers are selling access to real-time phone lo... by paulmd on Wednesday May 16, 2018 @02:44PM (#17085238)
The SIM card is a separate OS that gets underneath the SOC's OS. It can run its own applets without the knowledge or permission of the SOC OS.

https://www.youtube.com/watch?v=31D94QOo2gY

The baseband is a completely different RTOS as well. And then there's also TrustZone running in the SOC as well.

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