You can change the physical SIM card of the Saunalahti Prepaid subscription to a new one in Elisa's store. For the change, you will need: Your prepaid subscription number The PUK code of your prepaid subscription, which you can find on the SIM card frame of your subscription. For the activation of a new SIM card, we charge a service fee of 7,99 € according to the price list. NOTE! It is not possible to change the eSIM card of a Prepaid subscription without changing the number. The eSIM card is device-specific.