Because only the minutes of the Taiwan Province province 120-minute package card you bought before have been used up, but the validity period has not expired. In the same validity period, you can only extend the validity period by purchasing the same product several times, so you can only use the second purchase package after your last package expires. But you can buy the same package as in Taiwan Province Province, such as 60 minutes and 400 minutes, and you can call right away.