An eSIM is just a SIM but pre-embedded in the phone so the carrier can't provision a key inside a new SIM and then send it to you, they have to interactively an

An eSIM is just a SIM but pre-embedded in the phone so the carrier can't provision a key inside a new SIM and then send it to you, they have to interactively and remotely setup their trust in a key in your non removable SIM. There's not really any advantage AFA networks, etc, but it may be harder to GEO-restrict a software process than where you are willing to mail a new physical SIM, and of course it will be possible to support a lot more eSIM profiles simultaneously without the physical issues of trying to add bays for traditional SIMs that should be physically distinct if provisioned by different carriers.