How does Apple's mobile phone blacken the virtual cornet so that he can't call in?

1. Power failure, the called user pulls the caller into the blacklist of mobile phones.

2. According to the different settings of the setters, users entering the blacklist may have different forms of feedback.

3. Common forms of feedback are: the subscriber you dialed is not in the service area; The subscriber you dialed is busy; The subscriber you are calling is temporarily unavailable.

4. If you want to know whether you have been hacked, you can call to confirm, and dial every 5 minutes in 1 hour.