The sliding keyboard-equipped smartphone runs Android 9.0 Pie with an unlocked bootloader, and the company claims support for Lineage OS and Sailfish OS. They’ve also optimized the launcher, calendar, and email for landscape mode.
Links:
[1] http://www.tuxmachines.org/taxonomy/term/139
[2] https://www.cnx-software.com/2019/10/31/fxtec-pro1-smartphonesliding-keyboard/