When you receive a withheld or private call, simply decline or reject it. OppBlock will then instantly unmask the caller and send you their number via push notification, SMS, and email. This allows you to know exactly who tried to contact you without answering anonymous calls.

What is Silent Call Recording?

Silent Call Recording is a premium feature that allows you to capture an audio log of the unmasked call. When enabled, our system silently records the connection, providing you with an audio file for your records. You can activate this by selecting the 'Record' mode in your account settings. If 'Standard' mode is selected, the private caller will hear a busy tone.

What information will I receive?

You will receive the anonymous caller’s phone number instantly via push notification, SMS, and email. If you have the 'Record' package enabled, we will also provide a silent audio recording of the call attempt when available.

How quickly will I get the result?

Almost instantly, the caller’s number will be sent to you via push notification, SMS, and email within seconds of rejecting or declining the call

Is there a live demo?

Yes, our live demo feed shows our service working in real time. We encourage you to test it yourself! Simply call our live demo number with your own number withheld (by dialling 141 first). Watch as your number instantly appears on the feed, showcasing the speed and accuracy of our technology.

Will the anonymous caller know I’ve unmasked them?

No. The caller will not be informed that their number has been revealed. The process is discreet, and the caller experience remains unchanged.

Can I find out if my ex is calling me from a private number?

Yes. If your ex-boyfriend, ex-girlfriend, or a stalker is trying to hide behind 'No Caller ID', OppBlock will bypass the block. When you decline the call, their real phone number is instantly unmasked and logged in your dashboard so you have proof of the harassment.

Which networks are supported?

We support all major UK mobile networks across pay monthly contracts, as well as leading virtual networks and selected Pay As You Go plans. Supported networks include EE, O2, Vodafone, Three, giffgaff, Sky Mobile, iD Mobile, SMARTY, and Lebara. Network Compatibility Breakdown: • EE: Pay Monthly (✓) | Pay As You Go (✗) • O2: Pay Monthly (✓) | Pay As You Go (✗) • Vodafone: Pay Monthly (✓) | Pay As You Go (✗) • Three: Pay Monthly (✓) | Pay As You Go (✓) • giffgaff: Pay Monthly & Plans (✓) | Pay As You Go (✓) • Sky Mobile: Pay Monthly (✓) | Pay As You Go (✗) • iD Mobile: Pay Monthly (✓) | Pay As You Go (✗) • SMARTY: Monthly Plans (✓) | Pay As You Go (✓) • Lebara: 30-Day Plans (✓) | Pay As You Go (✓) • VOXI: Pay Monthly (✗) | Pay As You Go (✗) • Tesco Mobile: Pay Monthly (✗) | Pay As You Go (✗) • Other Pay As You Go: Pay Monthly (—) | Pay As You Go (✗) Note: We encourage you to test with our test connection code during signup. If your phone network confirms with "succeeded" or "successful", then your network is supported.

Why does the service only work with certain mobile networks?

Our technology integrates directly with major mobile networks. While this capability is built into most pay monthly phone contracts, some pay as you go plans don't support it yet, which is why compatibility can vary.

How do I install this app on my phone?

Installing OppBlock app is required to enable instant push notifications of your anonymous callers number. For iPhone/iOS (Safari): Tap Share, scroll and tap 'Add to Home Screen', confirm by tapping 'Add'. For Android (Chrome): Tap the three-dots menu, tap 'Install app' or 'Add to Home screen', follow instructions to confirm.

Do I need an app to use the service?

An app is not required for the service to work, as call details are sent via SMS and email. However, to receive instant push notifications on your device, you will need to install the web app.

How much does it cost?

To see all available plans, simply enter your number on our main page and press 'Start'.

Do you offer special pricing for returning customers?

Yes! We value our loyal customers. If you are renewing your subscription, log in to your account to see exclusive price plans available only to you.

Are my payment details safe?

Yes, your payment details are extremely safe. When you proceed to payment, you are redirected to Stripe's secure payment page, which you can verify by checking the URL in your browser's address bar. Stripe is one of the world's largest and most secure payment processors.

What happens if I don’t reject the call?

If you answer a private or unknown call, OppBlock will not be able to unmask the number. You must reject or decline the call in order for the service to work.

Can I block the unmasked number afterwards?

Yes. Once you have the number, you can block it directly using your phone’s call blocking settings or any additional call management services you may have.

Do you automatically block excessively repeated calls?

Yes. To enhance your peace of mind and prevent notification spam, our system includes an automatic protection feature. If a single withheld number calls you excessively (specifically, after 100 attempts), we will automatically stop sending SMS and email alerts for that number. However, every call is still logged and remains fully visible in your dashboard call history, ensuring you never lose a record.

Why do SMS alerts sometimes stop for a specific number?

To protect you from harassment and prevent excessive notifications from a single caller, our system has a two-stage throttling process: Temporary Pause (after the first call from a new number, SMS alerts for that specific number are automatically paused for one hour) and Permanent Stop (if the same number continues to call and triggers 15 SMS notifications, all future SMS alerts for that number will be permanently stopped). All subsequent calls are still logged in your dashboard.

Can the police trace a private number if I report it?

Yes, the UK police can trace a private number by requesting network logs under the Investigatory Powers Act. However, this is a slow process requiring a formal investigation. Many users prefer using OppBlock to instantly unmask the number themselves and provide the definitive proof directly to law enforcement for faster action.

Does it work internationally?

Our service is primarily designed for UK mobile networks. International compatibility may vary and is not guaranteed.

How do I cancel my subscription?

You have full control to cancel your subscription at any time directly from your account dashboard with no long-term contracts or hidden fees. Cancelling involves two quick steps: Step 1 (Dashboard): Go to Settings > Account Management and select Cancel Subscription (for iOS users, cancellation is managed here, not in iPhone settings). Step 2 (Handset): Dial ##67# on your mobile keypad and press call to deactivate with your network. Please note: Because unique connection numbers are promptly recycled once cancelled, dialing ##67# ensures the service is completely deactivated from your mobile network.

What is your refund policy?

If our system is unable to successfully unmask a private call, you are eligible for a full refund. However, once a private call has been successfully unmasked in your dashboard, the service has been rendered and we cannot offer a refund.

OppBlock

UK's #1 Private Call Unmasker

Reveal Who's Hiding Behind
No Caller ID & Private Calls

Stop the mystery and stress of anonymous calls. Whether it's an ex-partner, a stalker, or persistent harassment, find out exactly who is calling.

OppBlock instantly unmasks hidden callers, sending their real number straight to your phone.

Try Live Demo

Expose Anonymous Callers in 3 Steps

Configure

Activate directly through your mobile network using a simple shortcode, no app download required

Decline

When an anonymous, unknown, or 'No Caller ID' call comes in, simply decline or reject it

Reveal

We instantly unmask the call and display the caller's real phone number via text, email and push notification

See How We're Stopping Nuisance Calls

4.7 / 5 Average

Peace of mind back

Getting harassed for weeks. Set this up in 2 mins and saw there real number immediately

Lifesaver after iCaughtYou died

been looking for a working alternative since iCaughtYou stopped working in the UK, this is honestly better and way faster to set up

Works fine on O2

Does exactly what it says. Takes a couple of seconds for the text alert to come through but it successfully revealed the number

Essential for safety

As a woman living alone, this gave me control back over silent calls. highly recommended.

Only one that actualy works

i belive this is the only company in the whole of the uk that actualy works. tried 3 other apps and they were all scams

Doesn't work on Voxi

Customer service was very polite and refunded me immediately

Great support, my mistake

I did not follow the instructions about turning off iPhone live voicemail and i thought it was a scam, however support was instant and they guided me and also called me on private to make sure so it was working. i was so embrassed but very grateful

Didn't get refunded

app worked fine but they refused to refund me because i forgot to cancel my subscriytpn on time! i know its my fault but i think they should have been more understanding. i will not be using this service again

So happy to find you

I am so happy I found you guys, the support is really 24/7 I mesaged around 3am and got a resposne straight away to help me set it up. Highly recommend

An exceptionally reliable service

The setup process was completely seamless and the technology performs exactly as advertised. It successfully unmasked several persistent private numbers that were disrupting my daily schedule. I highly recommend this service for its reliability and outstanding performance.

Call recording is a lifesaver

Call recording helped me figure out exactly who was calling me. even with the number revealed i still didnt recognise it, but when they sent the recording to my email i knew their voice instantly. amazing feature tbh

Accepted by police for 101 report

The police told me they couldnt trace No Caller ID calls unless it was life threatening. Used this on EE, got the full number and timestamps, and handed the log straight to the officer for my harassment case.

Worked first try on giffgaff

was sceptical bc giffgaff normally blocks everything, dialed the code from the dashboard and declined a private call from my ex 10 mins later. text came thru in literally 3 seconds with his burner number

Bit pricey after trial but worth it

Wish it was slightly cheaper per month, however it is the only service in the UK that genuinely unmasks 141 calls on Vodafone. Cancelled once I caught who was ringing me at 2am and had no issues.

Stopped months of prank calls

My teenage daughter was getting nasty silent calls every evening on Three. Within one night we unmasked the number, matched it to a contact in her WhatsApp school group, and put a stop to it immediately.

No Tesco Mobile support

Didnt realise Tesco Mobile doesnt allow conditional call forwarding before signing up. Live chat sorted my refund in 5 minutes though so cant complain about the customer service.

Spot on with Sky Mobile

Set up took less than a minute on my Samsung S25. No dodgy app permissions or contact sharing needed, just a network code. Revealed two withheld numbers the same afternoon.

Finally sleeping through the night

Someone had been ringing me on No Caller ID between 1am and 4am for three weeks straight. Unmasked them on the very first rejected call, texted them their own number back, and they haven't called once since.

Works on all major UK networks

OppBlock is a dedicated UK service for revealing “No Caller ID”, Unknown and Private call numbers natively on EE, O2, Vodafone, Three, giffgaff, Sky Mobile, iD Mobile, Smarty, and Lebara. We provide reliable call unmasking to protect your privacy, peace of mind and stop harassment.

Reveal Who's Hiding Behind No Caller ID & Private Calls