@qnx_guy I can confirm that UT on f(x)tec Pro1-X is very stable, and battery life is good. Yes the keyboard works fine. The only tiny weakness I have found is that the mobile telephony receiver is not quite as “sensitive” about picking up a 4G signal as my other phone, a OnePlus 6T. (But it does pick up 4G, it's not a fault.) In all other respects, the Pro1-X is impressive. I haven't tried casting to an external monitor.

@wally I bought an MS Wireless Adapter V2 a few days ago. It works (my Pro1-X runs Android 11), but there's some lagging (sometimes it freezes a little bit, as well), and of course it not as stable as a HDMI cable.

@qnx_guy sms works on my PinePhone, calls do not so you might be ok.