oneplus 6T and poco F1 on mobian and postmarketOS. SDM845 devices with 8 GB RAM and fast storage, about the peak of performance you can have nowadays for about $50 apiece. I'd encourage anyone to get a cheap device, fun to play around with and prepare for the day when it becomes viable. ubuntu touch is also possible, but since it's halium (like android + linux VM) it wants me to downgrade to Android 9 which is virtually impossible for me; the former two run full linux kernels and don't have that limitation - spotty hardware support, though.

performance is acceptable, the power to do almost anything you want, access whatever and whenever you want. I run it without broadband, just wifi. the cameras are unusable. since I keep the modem off, GPS doesn't work either. so it's a linux laptop with touch, basically. the apps are a shitshow, rarely will you find one that supports touch and adapts to the vertical zoomed-in screen.

but it's getting better, shit's way better now than it was only a year ago and eventually it'll get there.

as long as you're aware it's not an android alternative, you'll have a good time.