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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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Sources: [1a] Kicksecure Mobile Phone Security https://www.kicksecure.com/wiki/Mobile_Phone_Security [2a] madaidans insecurities Whonix Dev https://madaidans-insecurities.github.io/messengers.html [2b] https://eprint.iacr.org/2015/1177.pdf Luke Smith Don't Use Telegram. Don't Use Telegram. Don't Use Telegram. Don't Use Telegram. Don't Use Telegram. https://invidious.jing.rocks/watch?v=qBTsUVrCDAQ [3a] Mental Outlaw Telegram Hands Over User Data to German Police https://invidious.jing.rocks/watch?v=t7HZrpJ4OyQ [3b] Mental Outlaw Telegram Review https://invidious.jing.rocks/watch?v=pZEH04nJ_hE [3c] Android Central Telegram reportedly gives user data to German authorities https://www.androidcentral.com/apps-software/telegram-reportedly-gives-user-data-to-german-authorities
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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