KDE Connect apparently doesn't know what 5G is. huh.
oh I see! it's going off SIM 1, and since I have two SIMs on it (one for calls, one for data) it just shows "Unknown" for that one. wow. 
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@awoo I vaguely recall some vendors doing weird shit with their Android builds where the network connectivity is misdetected by anything other than their own phone UI because it's internally tagged as another thing, so this one *might* not actually be KDE's fault (though I don't remember which vendors did this exactly)
@joepie91 fair. it might even be down to something on / around my phone not quite working with proper 5G hence why it falls back to the non-standalone 5G.