It's possible on any Android phone or tablet that supports a USB2GO to USB Host adaptor (it's just two connectors and wiring).
You may need to add a File Manager App. If you can download an ebook from Gutenberg and using the Filemanager copy it to a USB Memory stick, then any ereader will work.
The iOS is very difficult due to Apple's walled garden approach. I have an iPhone and it's impossible as far as I can see. I also tried an iPad. Apple doesn't intend "user files" except via Apple Cloud or iTunes (or replacement). Apple pretty much blocks use of external storage for user files (or even at all) on iOS.
I've done Download and File Transfer on ancient Sony Android Phone, recent Alctel and a Tablet all with different Android versions. All three devices work direct with a Micro SD card that then works in any ereader that has a Micro SD slot and also with USB storage mode on Kobo, Kindle, Sony, Nook ereaders as well as obviously USB memory stick and even a USB HDD with additional power (you can get a €4 USB only adaptor or a Y adaptor to power the slave device (needed for most USB HDD). What you CAN'T do on most phones / tablets is power the phone/tablet via USB while it's in Host mode with a device appearing as USB Mass Storage. A very small number of phones/tablets inc some running Windows do support external power in host mode.
So charge up your phone/tablet first.
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