In the long run, I’m pinning my hopes on the LibrePhone project, which is reverse-engineering firmware blobs to eventually offer open-source alternatives. I hope to be able to combine that with the Fairphone at some point (which, as I mentioned, already allows you to remove modules like the microphone, camera, etc.). But right now, there simply isn’t any alternative free, open-source firmware yet. So, yes, it’s the best option for now—though it’s still not trustworthy. Especially since old cross-device tracking methods, such as uXDT, continue to play a role there as well.

With PCs and laptops, there isn’t anything completely open-source either, but it’s still easier to run them in a completely isolated environment, because a smartphone that’s completely isolated loses its purpose—that’s the difference.