Can the mobile phone card issued by a Korean tourist visa still be used after returning to the country?

The mobile phone card issued by the Korean tourist visa cannot be used after returning to the country. According to the regulations of the Korean Immigration Bureau, if the validity period of the mobile phone card expires after returning to the country, the mobile phone card may have expired and cannot be used when re-entering South Korea, and needs to be applied for again. A Korean tourist visa is one of the necessary procedures for traveling to South Korea. Chinese citizens need to apply for a Korean tourist visa to travel to South Korea.