How do telecom users open the missed message reminder service?

Opening or canceling the missed SMS reminder service can be accepted through telecom business hall, customer service phone 10000, online business hall, WAP business hall, SMS business hall and other channels. The short hall processing method is as follows: send short message "KTLHTX" to10001; The cancellation method of the short hall is: send short message "QXLHTX" to10001; The service introduction method of the short hall is to send a short message "JSLHTX" to 1000 1.