My next smartphone is going to be the Librem 5, a GNU/Linux smartphone being developed by Purism. The Librem 5 is going to be a fully free (as in freedom) smartphone, where the entire OS is open-source, and the phone’s firmware (other than the cellular modem) is open-source as well.
It comes with 3 hardware kill switches, including camera/microphone, wifi/bluetooth, and the baseband (cellular) chip. All the being switched to off will enable “lock-down” mode. Since these are hardware (not software) kill-switches, there is no way a Librem 5 (if it were somehow hacked) can fool you into thinking the functionality is off when it is really still on. The camera, microphone etc will not have power.
The apps Purism will provide at launch are limited, basic functionality (such as phone, email, chatting etc). But Purism has created a library (libhandy) to easily port Linux apps to the phone. So I imagine apps will appear quickly for it, and 3rd party apps are already being ported.
This phone looks really interesting.
The Librem 5 is currently scheduled to begin shipping in Q3 2019.