this carrier approval to move esim problem is more generalized on modern “smartphones”. unless you opt in to cloud providers holding your data there is no easy way afaik to migrate your authenticator apps to another phone. and a host of other authentication/authorization data is tied to the device in an opaque way. don’t get me started on apple’s unpredictable model of sending 2fa to some other “trusted” device which means tou never know what tou need to bring with you.

> unless you opt in to cloud providers holding your data there is no easy way afaik to migrate your authenticator apps to another phone.

You could self-host Bitwarden/Vaultwarden, or something like that.

> don’t get me started on apple’s unpredictable model of sending 2fa to some other “trusted” device which means tou never know what tou need to bring with you.

I think they send 2FA to all supported devices on one's Apple account?

Google authenticator lets you move accounts easily using a QR code + phone camera.