GraphneOS only works on Pixel phones, I thought. You might be able to run LineageOS on your Samsung. Maybe I’m not being careful enough, but I’m on a Motorola phone with stock Android, and have focused more on avoiding spyware apps than worrying about the OS itself. I’d run GrapheneOS on my phone if I could, but at the end of the day I decided against a Pixel because I like the Moto hardware better and it’s cheaper.
Let’s rename Montezuma’s Revenge to Trump’s Revenge while we are at it.