The Best Call-Blocking Apps for iPhone and Android

If you are over 55, you probably get more scam calls than real ones. The "extended car warranty" calls. The "IRS" threatening arrest. The fake Medicare representative. The robot that says your Social Security number has been compromised. They come in waves, sometimes five or six a day, and blocking individual numbers does nothing — scammers use a new number every time.

Call-blocking apps solve this by identifying and filtering spam calls before your phone even rings. We tested the most popular options and found clear winners — along with a few you should avoid entirely.

How Call-Blocking Apps Work

These apps maintain massive databases of known scam and spam numbers — often tens of millions of entries. When a call comes in, the app checks the incoming number against its database in real time. If there is a match, the call gets blocked, silenced, or labeled as "Likely Scam" on your screen.

The better apps also use AI to detect patterns — like when a number was just created, or when many people report the same number in a short time.

Important privacy note: Some call-blocking apps work by uploading your entire contact list and call history to their servers. We avoided recommending those. The apps below either work on-device or have clear, respectful privacy policies.

Our Top Picks

Best Overall: Built-In Silence Unknown Callers (Free)

Before you install anything, your phone already has a powerful tool built in.

iPhone: Go to Settings → Phone → Silence Unknown Callers. This sends any call from a number not in your contacts, recent calls, or Siri suggestions straight to voicemail. No ring, no interruption.

Android: Open the Phone app → Settings → Caller ID & Spam → Filter spam calls. Google's built-in spam filter is surprisingly good and uses their massive database to identify scam numbers.

Pros: Free, no app to install, no data shared with third parties, works immediately.

Cons: May silence legitimate calls from numbers you have not saved — like a doctor's office calling with test results or a delivery driver. Check your voicemail and recent calls regularly.

Best for: People who rarely get calls from unknown legitimate numbers.

Best Third-Party App: Truecaller (Free + Premium)

Price: Free (ad-supported) or $3/month for Premium

Truecaller has the largest caller ID database in the world — over 2 billion numbers. When any call comes in, it shows you who is calling even if the number is not in your contacts. Spam calls get automatically labeled and can be blocked.

Pros: Enormous database, very accurate spam detection, works in real time, identifies unknown callers by name.

Cons: The free version has ads. Truecaller builds its database partly from users' contact lists — when you sign up, it may add your contacts to its directory. The premium version lets you opt out of this. Read the privacy policy carefully.

Best for: People who get calls from many unknown numbers and want to see who is calling before answering.

Best for Privacy: Hiya (Free + Premium)

Price: Free or $4/month for Premium

Hiya identifies and blocks spam calls without uploading your contacts or selling your data. Their spam detection is powered by partnerships with phone carriers (AT&T, T-Mobile, Samsung) and a database of known spam numbers.

Pros: Strong privacy policy, does not sell data, carrier-grade spam detection, simple interface, works well for seniors.

Cons: Smaller database than Truecaller, so it catches slightly fewer spam calls. Premium is needed for automatic blocking (free version only labels calls).

Best for: People who want spam blocking but care about their data not being shared.

Best for Comprehensive Protection: Robokiller ($5/month)

Price: $5/month or $40/year

Robokiller uses AI to predict and block spam calls even from numbers that have never been reported before. Its most famous feature is "Answer Bots" — if a scam call gets through, it can automatically answer with a pre-recorded bot that wastes the scammer's time while you go about your day.

Pros: Most aggressive blocking, AI-powered prediction catches new scam numbers, Answer Bots are genuinely entertaining and waste scammer resources.

Cons: The most expensive option. Some users report occasional false positives (legitimate calls blocked). The Answer Bot feature requires calls to be answered, which some people are uncomfortable with.

Best for: People drowning in scam calls who want the most aggressive solution available.

The Root Cause: Why Scammers Have Your Number

Call-blocking apps treat the symptom. To treat the cause, you need to understand why scammers have your phone number in the first place.

Your number is likely listed on dozens of data broker websites — Spokeo, Whitepages, BeenVerified, TruePeopleSearch, and hundreds more. These sites scrape public records, purchase data from companies you have done business with, and compile detailed profiles including your phone number, address, age, and relatives' names.

Scammers buy this data in bulk. That is why the calls never stop even when you block individual numbers — they already have your information and keep generating new numbers to call from.

Our Recommendation

For most people, the best approach is layered:

1. Turn on your phone's built-in spam filter (free, takes 30 seconds)
2. Install Hiya or Truecaller for additional caller ID and blocking
3. Sign up for DeleteMe to remove your number from data broker sites and reduce the volume of scam calls at the source

The built-in filter alone will eliminate 60-70% of spam calls. Adding a third-party app brings that to 85-90%. Removing your data from broker sites is the long-term fix that reduces the total volume over time.

What About the Do Not Call Registry?

The FTC's Do Not Call Registry was created in 2003 and does reduce calls from legitimate telemarketers. But scammers — who are already breaking the law — ignore it completely. Registering your number at donotcall.gov is still worth doing, but do not expect it to stop the scam calls. You need active blocking for that.

Key Takeaways

• Start with your phone's built-in filter — free and immediate
• Add Hiya (best privacy) or Truecaller (best database) for extra protection
• Robokiller if you want the most aggressive AI-powered blocking
• Remove your data from broker sites to reduce calls at the source
• The Do Not Call Registry helps with legit telemarketers but does nothing for scammers

You deserve a phone that rings only when someone you actually want to talk to is calling. These tools make that possible.

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