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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.
Huh, TIL, an esim is literally a sim soldered into the board.
Now I wonder, could something like the Pinephone FOSS modem firmware register a sim and resolve point 2?
I am not an expert but I don't think a modem has anything to do with registering the e-sim.
Even if it did, the hard part is probably getting the e-sim data/keys to be registered, not the uploading it to the e-sim chip itself.