Why does someone call, and there is no call interface on the mobile phone, only SMS notification?

Incoming call management: the old man-machine has the function of incoming call management, and non-family numbers cannot be entered, thus avoiding the trouble of harassing calls. The user sets the family number (that is, the phone number allowed to be answered) through the platform, and only the family phone can enter, otherwise the terminal will automatically hang up the phone with the non-family number.