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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.
Since way back in the 90s, everytime I stayed somewhere for longer than a week (or I really really needed mobile data) I would simply buy a local pay-as-you-go SIM for it.
This has been made even simpler to do with the advent of dual SIM phones were you can have a SIM for calls with your personal phone number and a different SIM for data.
Further, here in the EU ever since they passed some legislation some years ago, mobile operators can't charge extra for roaming within the EU so none of that is even needed anymore if you're just travelling withing the EU.
What exactly is the great advantage of eSIMs if you have a dual SIM phone?!
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.