I've been using Google Fi, but am thinking of switching to Airalo for data. I could then use Google Voice for phone calls - I almost never call. A problem is that GV won't text to European numbers, but many in Europe use WhatsApp and I suppose I could unpause Fi if necessary. There's cheaper data than Airalo, but Airalo seems to use carriers local to individual countries, while cheaper eSIMs tend to be in a single cheap country, so you end up roaming (slower and sites think you're in, for example, Poland when you're actually in France), and since I use very little data, usually under 1gb/week.

You used to be able to use data on your phone for wifi calling using another SIM, but that seems to have disappeared from Android 14 on my Pixel 8P.

How does that sound?