Your call credit remains valid for 12 months, and is extended with max. 12 months with each top up. The extra data, SMS and free minutes that you get with a top up are valid for 30 days.
So be sure to top up your card at least once every 12 months or you will lose your remaining call credit and your SIM card will be deactivated.
Has your SIM card been deactivated? Then your SIM card can no longer be used. You will need a new prepaid SIM card to continue using the BASE-services.
You can buy a new prepaid SIM card via My BASE.
Log on to My BASE to check the validity of your call credit.