How does China Mobile Shenzhouxing mobile phone card open the call reminder service?

Hello, at present, the call reminder service of Beijing Mobile refers to the service that the system records the call information when the customer is turned off, out of service area and unable to answer the phone, and informs the customer of the call information by SMS when the customer is turned on. The tariff is: 3 yuan/month. Customers can use this machine to edit the short message "KTLD" and send it to 10086 to start this service. The application will take effect in the same month. Please know, thank you!