I already have the usb PureOS OS installation procedure down, that being on the USB-A. I am also glad that the Purism company is selling its own copies, which could be handy for worst case scenarios. https://shop.puri.sm/shop/usb-flash-drive/
For most of the time, I don’t consider using phone devices, much less expected as a Linux OS! Considering its size and sense of portability, a Linux on a phone device with battery charge might have situational uses.
The only problem is given its size, phones have to use their own type of port designs. I am worried that somehow, the OS on the phone may fail as there is no guarantee given the potential of user inputs. If the OS on the phone fails, I want to have the means to get a backup device and install the PureOS again. Of course, the phone needs to have a bootloader before any OS installation can take place. To this day, I don’t recall that the PureOS have a bootloader with its installation. I was hoping that the GNU GRUB or Libreboot bootloader will be available. As for which bootloader is the best, I have yet to find out!
Back to the port, the phone device uses USB-C ports. I may need a USB-C device with PureOS OS installation. It appears that the Purism USB-C Hub has got me covered on my request in alternating between USB types. https://shop.puri.sm/shop/usb-c-hub/
Boasting port compatibility is its strength. Still, it’s quite expensive and if you are not going to use various port types, a USB-C device with PureOS installation medium would do the job just fine. A restricted USB-C to USB-A data cable just as well!
Of course, if phone device’s USB-A/USB-C port is busted from over-use, parts need to be remedied by order for self-repair or repair service.