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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.
If the phone supports a normal and eSIM at the same time, they are equivalent. Because in many countries, dual SIM phones are (and will be) harder to get than single SIM ones, so having eSIM at least allows that.
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.