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by lxgr 1678 days ago
Not really updated, but new applications can be remotely installed and then interact with the baseband and (to a limited extent) the smartphone OS.

It‘s not "any entity", though – the provider’s keys are needed to do this, and they can already do much of that tracking using other, network-side means.

If the signing keys are compromised, though, bad things can happen: https://www.srlabs.de/bites/rooting-sim-cards