How to Block No Caller ID Calls Permanently

Why You Should Stop Ignoring Unknown Calls

Many people simply ignore 'No Caller ID' calls, hoping they will stop. Unfortunately, persistent nuisance callers or stalkers will continue to call if they believe they are successfully hiding their identity.

To permanently block these callers, you first need to know their real number.

Step 1: Unmask the Number

Using our service, you can easily reveal the number behind a private call. When the phone rings with an unknown ID, decline the call. Within seconds, our system will intercept the call, unmask the number, and send it directly to your dashboard and via SMS.

Step 2: Block on Your Device

Once you have the unmasked number, blocking them is simple:

On iPhone (iOS):

1. Open the Phone app.
2. Go to your Recent calls or Contacts.
3. Tap the 'i' icon next to the newly unmasked number.
4. Scroll to the bottom and tap Block this Caller.

On Android:

1. Open the Phone app.
2. Go to your Recent calls.
3. Long press on the newly unmasked number.
4. Select Block/Report spam.

Regain Your Peace of Mind

By unmasking and blocking persistent nuisance callers, you take control of your privacy and ensure your phone only rings for people you actually want to speak to.

Related UK Network Guides: Compare our carrier-grade switchboard against iCaughtYou and MaskOff, or read our 2026 UK MVNO Call Forwarding Compatibility Guide.