How to activate the missed call reminder service in China Mobile M-Zone when the phone is shut down?

If you are a Beijing Mobile M-Zone customer, you can send the text message "KTLD" to 10086 to apply for the incoming call reminder service. After successful activation, you will not be able to answer calls when your mobile phone is turned off, is not in the service area, etc. , the system records the incoming call information, and when the customer turns on the phone, the system notifies the customer of the incoming call information via SMS. The incoming call reminder service costs 3 yuan per month. Apply in the same month and take effect in the same month. Please understand.