How does Unicom cancel or close the international short message function?

The tariff for 3G users to send international short messages in China is 0.8 yuan/piece, and domestic reception is free. Dear, you don't take the initiative to send international text messages in China, and there is no charge. I suggest you call the local hotline 100 10 first. As long as the mobile phone has the short message sending function, you can use international short messages. There is no such thing as canceling or closing international short messages, as long as you don't send international short messages.