How to cancel the monthly subscription of mobile card SMS 10 yuan?

Internet access 10 yuan Package 100M Traffic: Please send a text message to10086 for the package that takes effect immediately; Please send a text message to 10086 for the package that will take effect next month, which is 0.29 yuan /M more than the package. . . If you don't use it next month, please cancel it at the end of this month. If you cancel the 10 yuan subscription of 100M, please send a text message to 302009 ext. 10086. The cancellation will take effect next month, and the normal fee will be charged this month. If successful, there will be a text message prompt. After closing, the remaining traffic does not enjoy the "unclear traffic" service and cannot be carried forward to next month.