These apps cannot reveal a truly hidden number from an individual. If your friend dials #31# before your number, no app will unmask it.

If you previously enabled a setting to automatically reject anonymous calls, you can reverse it through your phone's native settings. YouTube·MDTechVideoshttps://www.youtube.com How To Unblock Unknown Calls on Android Phone [Guide]

Some carriers redact this for privacy. Smaller MVNOs (like Mint, Cricket, Metro) usually show the actual number.

Because there is no phone number attached to the call, you cannot simply go into your recent calls list and unblock it like a standard contact. However, there are several ways to manage these calls, trace them, or prevent them from reaching you in the future.

Here is a breakdown of how to handle "No Caller ID" on Android.

If your goal is to stop these calls entirely, Android has built-in features to block callers who hide their identity.