On the website, choose BankID on mobile for login or other services.
The website will ask you to enter your mobile number and date of birth. Once you've done this, a reference code will appear.
The site sends a message to the SIM card on your mobile and asks you to confirm the selected service on a given website. The message also contains the reference code and you must verify that this is the same code.
You confirm by entering your self-chosen PIN for BankID on mobile (four to eight digits).
The SIM card then sends a confirmation back to the site, which can verify your identity. If the verification is ok, the selected service is performed on a given website. This can, for example, sign in to online banking or make payments.