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More and more people are ditching carrier roaming in favor of travel eSIMs
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
You can have as many esims as you want too, so you can have 10 numbers or data packages if you want. Just open the app, buy one, install it and it's ready to go, no need to deal with phone companies.
Do they all connect to their phone networks at the same time? I doubt that...
I've never noticed that they disconnected if I had them enabled. But I've never had more than a couple active at a time.