What are the validity periods of the prepaid card and the credit?

Your prepaid card is active for 365 days as of the first activation. Upon top-up the validity period of the card is extended in accordance with the recharged value and the remaining validity period of the card.
If the validity period of the card is not extended, the card will be automatically deactivated after the validity period expires and you will not be able to use this mobile number. In this case the available credit and usage are lost.
The validity of the credit (the top-up amount) upon each top up is different and depends on the top up value and the remaining validity period. If no top up is made during the validity of the available credit, the available credit is lost.
See how to extend the validity period of your prepaid card.