There is a charge for sending foreign text messages at home and Korean text messages at home.

Sending a message abroad is more than one yuan. Answering the phone is free unless there is a two-way charge. It's expensive to call China from Korea. How can I get from China to 3.4 yuan in one minute? But who can end the conversation in a minute? I suggest using VoIP. I used to call 1.6 from Korea, and it was the same money, but I needed a computer to use it, but it was not recommended in China. Calling from Korea is more expensive, 5 cents a minute. Also, Korean friends can buy a card to call China, won 1w China, more than 50 yuan. It's very cost-effective to talk for more than 2 hours. You can tell your friend how cost-effective it is to ask him to buy a card to call you. It's free to answer the phone and chat casually.