NJOI Prepaid credit will have an expiry date of 60 days from the day of your last top-up. Upon expiry, your expired credit will no longer be available for use. Performing a top up before the expiry date of your credit will renew the expiry date of the total credit amount in your prepaid account. It will override the previous expiry date and give another 60 days of validity from the day of credit top up.