> The less stupid variant is, of course, to get mobile operators to issue SIM cards with e-sign capabilities. Estonia has that, for example: https://www.id.ee/en/mobile-id/
It works great. Just keep in mind that newer phones are starting to deprecate physical SIM slots. At the same time certifying eSIM implementations to the same EAL level is an absolutely crazy task.
> At the same time certifying eSIM implementations to the same EAL level is an absolutely crazy task.
It probably is, but it does make sense. eSIM standards were built to solve pretty much the same problem (make cloning eSIM profiles impossible), so it should be a good anchor of trust for that.