@neil

I sold mine about a decade ago to someone who would likely have made far better use of it than I would (it had a physical keyboard, but its membrane-nature was counter to my desires). But it was solid hardware and I don't know how upgradeable it would be to mainline Linuxen…

@neil

how Linux does it need to be?

There are some phone-devices with Blackberry-like keyboards such as the Unihertz Titan series¹ that provide Android (Linux kernel under the hood, usable in conjunction with Termux)

Or with other OSes, I know that the Psion 5mx had/has a NetBSD build² and OpenBSD used to run on the Sharp Zaurus³ which had physical keyboards.

There was also the (now-discontinued) Pocket CHIP⁴ that I had but later sold, offering a pretty decent keyboard+battery+wifi+screen setup. As I type this, I see @grwster replied with a similar-looking "Blackberry Pi" device.

⸻
¹ https://www.unihertz.com/collections/titan-series

² https://wiki.netbsd.org/ports/epoc32/

³ https://www.openbsd.org/zaurus.html

⁴ https://shop.pocketchip.co/