If you are being harassed or threatened, this is the nuclear option.
The process depends on whether you are trying to allow incoming private calls or if you want your own number to stop showing as "Private" to others. how to unblock a private number
Unblocking private numbers means you will receive all calls from hidden caller IDs again. This includes: If you are being harassed or threatened, this
By following the steps above—phone settings, carrier codes, and app settings—you can fully unblock private numbers on any modern smartphone. how to unblock a private number
If the original call came in as "Private" or "No Caller ID," it may not appear in your blocked list as a phone number, but rather as "Unknown" or "Private." You can unblock that entry to allow future hidden calls to come through.
Unblocking a "private" number can mean two things: either you want to from people who hide their caller ID, or you want to stop hiding your own number when you make calls. 1. How to Receive Calls from Private/Unknown Numbers