Do I need to send a text message to Korea in Korean?

LZ, SMS can be sent in Pinyin or English, not necessarily in Korean.

Never send Chinese, it will be displayed as garbled code on Korean mobile phone. As far as I know, there is no mobile phone supporting Chinese menu in Korea at present.

Also, when sending a text message, the number is first the country number 0082, and then the mobile phone number.

Because Korean mobile phones all start with 0, it is necessary to remove the first O and directly add the mobile phone number with 0 removed after 0082.

For example, you want to send a short message to a user whose mobile phone is 0 10- 1234-5678.

Just 0082-10-1234-5678 ~