[MartijnBraam]

Modems in modern phones are all integrated in the SoC, it's technically seperated by iommu, but the issue with that is that you can't verify that the iommu works. There isn't really anything preventing the modem having some hard lines into the RAM.

With the PinePhone (and also the Librem 5) the modem and SoC are physically seperate so the communication between those two components can be inspected and controlled.

[mirimir]

Thanks. So OK, it comes down to trusting IOMMU.

But iOS devices don't have the cellular modem in the SoC.

And neither does the latest from Qualcomm with 5G, which I gather will go in at least high-end phones.