Via My Viking, you can add authorizations for a specific SIM card. Log in to the account the SIM card is registered on, and enter the e-mail address of the account that wants to take over the SIM card. Both parties have to confirm, and that's that!

It's not possible to create a new account without requesting a SIM card. This means it's also not possible to give authorizations for a SIM card to a person who doesn't already have a Mobile Vikings SIM card.