How to mute Apple's black spots?

The default ringtone is set to mute file, and then only your friend's ringtone is set to ring. The address book can specify the ringtone when someone calls, so add people who don't want to answer the phone to the address book and set their ringtones, text messages and ringtones to mute. Call the names of those who don't want to answer the phone "harassment", so that such names can be ranked at the end of the address book, which is convenient for the management of the address book. SMS comes with "Mute" → Select "None"; Make a "silent file" for ringtones and upload it to your iPhone. Advantages and disadvantages advantages: no prison break, stability, safety and practicality.