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Your phone rings, and the screen shows an unknown number. Scammers use spoofing software to disguise their caller ID, making it look like a local business or government agency is on the line. They rely on the surprise of a ringing phone to rush you into paying fake debts or buying useless software.
If you answer a scam call, your number gets marked as active on criminal lists, guaranteeing even more harassment. You need a way to screen the noise instantly. That is why we are introducing Call Shield from ScamAdviser — a dedicated spam call blocker app designed to filter out the threats so you only talk to real people.
Instead of guessing who is on the other end, the app takes control the moment a call comes in. You choose your region code, enter your phone number, and the app begins filtering. When an unknown number dials your phone, the app checks the caller against a live database before you even answer.
You get an immediate lookup result directly on your screen. From there, you make a clear choice: call back, report the number, or block it entirely.
Scam calls move fast. Fraudsters switch numbers daily, spoof trusted businesses, and bombard victims with robocalls designed to steal money or personal data. Simply having a caller ID app is no longer enough.
With Call Shield from ScamAdviser, you can identify unknown callers, block scam numbers automatically, and stay protected with a threat database that updates every single day. Here is how to use the app's main features on both Android and iPhone.
Ever stared at your phone wondering, "Who called me?" Call Shield answers that immediately.
The app checks incoming numbers against Google databases and public online sources to uncover the real identity behind unknown calls. Instead of seeing a random number, you can often see the caller's name before you answer.
On Android, the app works directly with incoming calls and your call history. On iPhone, caller information appears natively on your call screen. Even if an iPhone user temporarily loses internet access, the app can still rely on its offline database fallback to help identify suspicious callers.
Scammers constantly rotate phone numbers to avoid detection. A number blocked today may be replaced tomorrow.
That is why Call Shield updates its fraud database daily, adding and classifying more than 200,000 new phone numbers every single day. The app quietly refreshes in the background so you always have the latest protection without needing to do anything manually. Numbers are sorted into categories including fraud and scam calls, robocalls, harassment calls, fake debt reduction schemes, and spam marketing calls.
This daily updating system helps you stay protected against emerging scam campaigns before they spread widely.
One of the most powerful features in Call Shield is automatic scam blocking.
Every incoming number is assigned a risk level. If a caller has already been flagged as spam or fraud, the app can reject the call instantly before your phone even rings. Android users can also track how many scam calls were blocked over time and manually add unwanted numbers to their personal block list — turning your phone into an active robocall blocker rather than just a passive caller ID tool.
Scam calls are not always caught in real time. Sometimes you notice a suspicious missed call hours or days later.
Call Shield helps by retroactively scanning your call history and attaching names or warning labels to unknown numbers, making it easier to spot suspicious callers you may have ignored. On Android, the app reads your call log and identifies unknown numbers automatically. On iPhone, caller identification appears directly through the native call interface for a smoother experience.
A security app is only as good as the data powering it. Outdated databases let new scammers slip through undetected. ScamAdviser harvests 200,000 threat numbers daily, maintaining a live intelligence feed of active scams.
When a fraud ring spins up a new block of numbers in the morning, our system flags them by the afternoon. This constant update cycle stops criminals pretending to be your bank or the government before your phone even rings.
Call Shield is built to be accessible to everyone, with two tiers designed around different needs.
| Feature | Free | Premium |
| Reverse phone lookup | ✓ | ✓ |
| Daily threat database updates | ✓ | ✓ |
| Automatic scam call blocking | ✓ | ✓ |
| Smart call history scan | ✓ | ✓ |
| Surf Shield (24/7 web protection) | — | ✓ |
| Ad-free experience | — | ✓ |
| Price | Free | $60/month or $690/year |
The free tier gives you full access to reverse phone lookups, live threat updates, auto-blocking, and smart call history — supported by short video ads. Premium removes all ads, adds 24/7 Surf Shield protection for browsing safety beyond calls, and includes a 7-day free trial so you can test the experience before committing.
You should never feel anxious when your phone rings. Call Shield gives you the exact tools you need to stop robocalls and block fraudsters permanently. Download the app today from the Google Play Store or Apple App Store and start your 7-day premium trial to see exactly who is trying to reach you.
If a scammer does slip through your carrier, run a phone number checker, report the exact number to the FTC at ReportFraud.ftc.gov, and flag it directly in the Call Shield app.
Your phone belongs to you, not the scammers dialing it.
Frequently Asked Questions
How does the reverse phone lookup find caller names?
The app queries Google databases and public online sources to attach a real name to the unknown number calling you.
Will Call Shield block legitimate calls from my doctor or bank?
No. The app relies on a constantly updated database of 200,000 daily threat numbers to ensure only confirmed spam and fraud calls are blocked.
Do I have to pay for Premium to block scam calls?
No — the free version includes all auto-blocking and lookup features, supported by short video ads.
What does Premium add over the free tier?
Premium removes all ads and unlocks Surf Shield, which extends your protection to web browsing 24/7. You can try it free for 7 days directly in the app.
Adam Collins is a cybersecurity researcher at ScamAdviser. With over four years on the digital frontlines, he specialises in translating complex threats into actionable advice.
