Fairphone phones have a good history of supporting alternative operating systems, like lineageos: https://wiki.lineageos.org/devices/ https://wiki.lineageos.org

Fairphone phones have a good history of supporting alternative operating systems, like lineageos: https://wiki.lineageos.org/devices/ https://wiki.lineageos.org/devices/ or /e/ https://doc.e.foundation/devices/FP4 https://doc.e.foundation/devices/FP4 (which also sells fairphones with their os pre-installed. They document how to unlock the bootloader here: https://support.fairphone.com/hc/en-us/articles/10492476238865-Manage-the-bootloader https://support.fairphone.com/hc/en-us/articles/104924762388...