How does China Mobile cancel 30 yuan's 500m traffic package via SMS?

4G Internet traffic package 30 yuan package 500M: Please send a short message "KT4GLL30" to 10086 as soon as it goes online in the current month, and you can use it normally after receiving the short message prompt, exceeding 0.29 yuan/m.. If you don't use it next month, please cancel it at the end of this month. To cancel the 500M traffic package in 30 yuan, please send a text message to 0000 to 10086, and you can cancel it according to the SMS prompt. The cancellation will take effect the next month, and if it is successful, it will be prompted by SMS. After closing, the remaining traffic does not enjoy the "unclear traffic" service and cannot be carried forward to next month.