Log in to My Vodafone and choose the section My SIM / eSIM.
To log in to My Vodafone you need an email and password. Login to the self-service is confirmed by two-step verification via SMS, if you do not have this option, please use other options or contact us on the Customer Care Line.
In the SIM card and mobile phone section, you will see your PIN, PIN2, PUK and PUK2 codes.
Please note that no one can ever find the changed PIN, as you enter it right into your telephone.
Other possibilities: