What is a Private Number?
A hidden number can also be known as a ‘private number’ – or any call that rings through, but does not show the number.
How To Block Private Number
Silence incoming unknown callers by going to “Settings > Phone > Silence Unknown Callers.”
Use DND to prevent private numbers from annoying you by adding a new DND mode and allowing calls from your contacts.
Block individual callers by tapping and holding on the caller then selecting “Block Number.”