https://calyxos.org/ and https://grapheneos.org/ both go part of the way. They're hardened, privacy-preserving Android flavors that work best on Google Pixel 3 - 5. CalyxOS emulates google services so you can use basically any Android app, while GrapheneOS goes further down the security hardening hole.

You still can’t trust the baseband blob which has DMA access on most devices.