> as you cannot program the keys into the card
You don't need to program the keys into the card, you program the card's identity/public key into the network.
You don't need to program the keys into the card, you program the card's identity/public key into the network.
What I guess you mean is, you buy an inactive SIM from Vodafone (which has Vodafone-known keys on it), and then you’re telling Vodafone to use that card.
By „bring your SIM“ I thought of something non-branded and was surprised.
Essentially that is what’s happening with eSIM, hence the need for the provisioning step that also makes transferring hard.