A phone has become the Cosmo Communicator that looks like a laptop and company Planet Computers now supports playback function multi, which lets you run Android and Debian Linux, and TWRP on the same device without replacing the other.
You will have to divide the storage space on the device and find out how to access the settings of the boot, and in the end will give you a way to run Linux applications, or try your phone in another way. The company confirmed that you won’t lose updates to the Android system if you have installed Linux.
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Think Cosmo suited for Linux thanks to the keyboard’s own, and is available the firmware multi-boot free, as there are instructions about installing Debian and other software.