Thanks! Yes it's very puzzling. When the icon's greyed out, I could still do the hotspot log in, and surf using the hotspot browser, but the icon would stay greyed out all the time. Only with the data-enabled SIM would be icon be solid.
If I check under "Manage Connections", it would show that the WiFi network is connected, but on the RHS where you'd expect to see a green tick (for connected), I see a dash. Strange, but hotspot browser still works then.
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