Sorry if it was unclear the sources were in the comments. Phones have a baseband modem which is insecure, and easily hacked. This has just one reference, but basic search will show a lot. We also might write an article on it in the future.
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It says here the baseband has full access to memory and can compromise it unless IOMMU used, which all the devices GrapheneOS supports have, so it's not an issue
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