For an extra answer, GrapheneOS is based on stock Android, in contrast to the Linux-phone options they mentioned. Since it’s only (officially) supported on Pixel phones and focuses on security and privacy more than other customization, it’s actually the most stable and easy transition I’ve made, coming from an Android phone already. Installer is super easy compared to other phone OSs I’ve tried, you can do it by connecting the phone to a computer, opening https://grapheneos.org/install/web , and just pressing buttons to do all the normally-complicated steps. I was very impressed with that.