Ironically, the best phones to do that are Google's own Pixels - to give credit where it's due, at least the phones have unlockable bootloaders (unless you buy

Ironically, the best phones to do that are Google's own Pixels - to give credit where it's due, at least the phones have unlockable bootloaders (unless you buy the Verizon variants). eg GrapheneOS currently only supports Pixel 2, 3 and 3a: https://grapheneos.org/releases https://grapheneos.org/releases