Can China Telecom Mobile Phone Card be used in Korea?

In the roaming state of international, Hong Kong, Macao and Taiwan, the voice services that China Telecom mobile phone users can use include basic voice services such as calling local, calling back to Chinese mainland, calling third-party countries and regions and called services, as well as supplementary services based on the above basic voice services, such as unconditional call forwarding and call waiting that users have opened. Except for local calls and calling services such as calling back to Chinese mainland and calling third-party countries and regions, other voice services are used in the same way as in China. Please pay attention to/