How does China Telecom subscribe and cancel a data plan via text message?

There are two types of telecommunications data packages, one is refueling data, and the other is meal data. There are instructions for activating and canceling the two types of data below:

Instructions for using gas data and Handling and Cancellation Instructions

Instructions for using additional meal data and handling and canceling instructions

In addition, telecom users can now also obtain 100m data traffic for one penny by participating in Baidu Wallet’s exclusive event Overlay traffic/?invite_code=JEL7WT6W This activity is Baidu’s official official activity. Through the activity, telecom users can purchase 100m of domestic general traffic for one cent. This traffic will take effect in the same month after it is processed. It is also a refueling package traffic of China Telecom. There is no need to manually cancel it after purchase, and it will be automatically canceled next month.