Yaay! My (WiFi) Gemini arrived yesterday, and I can finally post to the forum again(!) Many thanks to Varti for figuring the problem out -- my own stupidity in the end.
My general opinion is utter delight. The keyboard feels fine under my fingers. Seem to have less spacebar problems than I do on my laptop. Have to do a little searching for the characters like '-' in unaccustomed places, but that won't bother me long.
I could have done with a few more details on the 'Power LED'. The Quick Start said that the battery would be only half-charged, so the first thing I did was plug it in. The LED went red for a few moments, and then turned green. Wasn't sure what that indicated, so I left it alone for another (impatient) hour. Watching it charging again right now, it still hasn't turned entirely green, though the status panel says only a few minutes left. I like the way the status estimates remaining battery time by how much it's been used. It jumped from "8 hours" to "13 hours" overnight, with a flat graph. (It seems to be rather optimistic about actual charging time needed.)
I spent yesterday installing some probably-needed apps. I went straight for Fdroid and Yalp, having heard good things about them here. I got Firefox through Yalp, and am slowly getting used to the small-screen differences from the version I know. I'm still doing this post on my laptop, as I'm not quite comfortable with it yet. Also added K-9 mail (after looking it up and getting confused by "K9" web child-protector!). It's been crashing on me way too much, but I have managed to send mail.
Does anybody know a good audio streaming app that takes a simple URL? I've got in the habit of having my Pi streaming Radio Caroline, and it would be nice to take the stream with me to the coffee shop. There is a Caroline app, but I much prefer getting the stream directly, so I'm in control.
I haven't installed Word yet. I don't normally need full word-processor features, so is there any editor somewhere between that and Notes?
Oh, yeah -- I also installed Termux (with vi!), but it seems to have its own dataspace, so I'm not sure if I can access Android files.
I don't think a WiFi-only flashing kit is available yet, but in any case I want to get a feel for the new-to-me Android first.