Just curious.
I used eSim for a while when I first got a phone that supported eSim, because I wanted to make it harder for a thief to disable the phone tracking, but now my main phone is broken and I’m a bit annoyed at having to chat with customer support for half and hour to activate eSim on another device.
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Phone numbers and SMS should never have been involved with user authentication beyond simple contact info. Smartphones really ruined it.