Why can Apple watch the black screen call reminder when the phone is black?

The reason why the black number can still be called may be that the mobile phone is out of order.

Solution:

1, restart the phone;

2. Reset contacts and add them to the blacklist;

After opening the communication, click on the contact to be blacklisted. In the contact details list, click the option of "Block this call number" at the bottom, and then click "Block contact" in the confirmation block option that pops up, or go to Settings-Phone-Blacklist-Edit to add and delete blacklists.