There are many custom ROMs based on AOSP: GrapheneOS (for security against hacking and confiscation), LineageOS and its descendants /e/OS, iodéOS, and crDroid, etc. CalyxOS is not doing well right now, but it should be back in a few months.
Make sure you can relock the bootloader after installing to protect against attacks through the USB connector.
Murena ships /e/OS preinstalled on the European Fairphone and Shiftphone. Iodé similarly.
Then there’s Volla phone which can have Linux (Ubuntu Touch) and and VollaOS (AOSP-based) on the same phone. There are other Linux phones, but nobody recommends them for normal consumers.
There are many custom ROMs based on AOSP: GrapheneOS (for security against hacking and confiscation), LineageOS and its descendants /e/OS, iodéOS, and crDroid, etc. CalyxOS is not doing well right now, but it should be back in a few months.
Make sure you can relock the bootloader after installing to protect against attacks through the USB connector.
Murena ships /e/OS preinstalled on the European Fairphone and Shiftphone. Iodé similarly.
Then there’s Volla phone which can have Linux (Ubuntu Touch) and and VollaOS (AOSP-based) on the same phone. There are other Linux phones, but nobody recommends them for normal consumers.