this post was submitted on 25 Jun 2023
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GrapheneOS often picks up security flaws in the android open source project and fixes them before google goes. I won't claim they fix everything but I've seen enough examples of things they fix over AOSP that make me doubt they wouldn't have fixed something like that (on top of keeping everything updated). Maybe you weren't referring to Graphene but still worth a shoutout for being a very (the most?) secure operating system.
I'm talking about the baseband, the device that talks to the cell network (among many other functions). It has its own closed-source firmware, no open-source substitute for that firmware exists, and it has full access to the entire system, bypassing the CPU and OS. Installing a different OS will not stop attackers from exploiting vulnerabilities in the baseband firmware and taking over the phone.