How to set up the rejection of overseas calls and text messages?

The following methods are set to reject overseas phone calls and text messages:

After sending the short message "KTFSR" to 10086, mobile users need to manually turn on protection and international or Hong Kong, Macao and Taiwan interception in strict accordance with the guidelines, in order to really turn on this function.

Non-standard setting means that there is no setting step. Actually, there are not many steps. Be patient.