If your own number is showing as private against your will, check the Microsoft Learn forums for advice on fixing "bad reputation" flags on your number.

If you unintentionally blocked a specific contact, the Google Phone app community suggests checking the "Spam and Call Screen" menu specifically. To help you find the exact setting, could you tell me: What model of phone are you using?

In some regions, telecommunication carriers offer services to trace the last incoming call, even if it was private.

To unblock private numbers, you generally need to disable the "Block Unknown Callers" or "Anonymous Call Rejection" feature in your phone's settings. 📱 Unblocking on Mobile Devices

Use Keypad Codes: Dial *87 to turn off network-level anonymous call rejection.