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Best Block Unknown Callers Free Apps

249+ iOS apps curated and reviewed

4.5 avg rating
20 free apps
Updated August 2026

Out of 249+ block unknown callers free apps on iOS, 20 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top Block Unknown Callers Free Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Robokiller: Spam Call BlockerRobokiller: Spam Call BlockerFree4.5★ (414K)NoYesAug 2026
2TrapCall: Reveal No Caller IDTrapCall: Reveal No Caller IDFree4.2★ (25K)YesYesAug 2026
3Verizon Call FilterVerizon Call FilterFree4.7★ (300K)NoNoAug 2026
4T-Mobile Scam ShieldT-Mobile Scam ShieldFree4.7★ (208K)NoNoAug 2026
5Truecaller: Premium Caller IDTruecaller: Premium Caller IDFree4.4★ (252K)YesYesAug 2026
6Hiya: Spam BlockerHiya: Spam BlockerFree4.5★ (237K)NoYesAug 2026
7Easy Caller IDEasy Caller IDFree4.3★ (2.7K)NoNoAug 2026
8True CallerID: Spam BlockerTrue CallerID: Spam BlockerFree4.3★ (256)NoYesAug 2026

Top Picks for Block Unknown Callers Free

Robokiller: Spam Call Blocker#1

Robokiller: Spam Call Blocker by Mosaic S.r.l.

Stop 99% of Robocalls & Texts
Editor's Choice
🔧 Utilities
4.5😐(414K ratings)
FreeIn-App Purchases
#9in Utilities
Robokiller: Spam Call Blocker screenshot 1
Robokiller: Spam Call Blocker screenshot 2
Robokiller: Spam Call Blocker screenshot 3
Robokiller: Spam Call Blocker screenshot 4
Robokiller: Spam Call Blocker screenshot 5
Robokiller: Spam Call Blocker screenshot 6

This app blocks up to 99% of unwanted spam calls and texts using advanced AI and a vast database. It also offers a unique feature to annoy spammers with automated responses and protects your personal information from being sold online.

What We Love

  • 🚀 Blocks spam calls effectively
  • 😂 Entertaining answer bots
  • 🤫 Reduces unwanted call volume
  • 👍 Convenient call screening

Room to Improve

  • 🐛 App issues like resetting, deactivation, and call forwarding problems
  • 🚫 Blocks some legitimate calls
  • 🤖 Concerns about increased spam calls after using the app
TrapCall: Reveal No Caller ID#2

TrapCall: Reveal No Caller ID by Mosaic S.r.l.

Control Who Calls You & Block
Strong Contender
💼 Business
4.2😞(25K ratings)
FreeAdsIn-App Purchases
#28in Business
TrapCall: Reveal No Caller ID screenshot 1
TrapCall: Reveal No Caller ID screenshot 2
TrapCall: Reveal No Caller ID screenshot 3
TrapCall: Reveal No Caller ID screenshot 4
TrapCall: Reveal No Caller ID screenshot 5
TrapCall: Reveal No Caller ID screenshot 6

Unmask blocked and unknown callers, stop spam, and protect your privacy. Get caller ID for masked numbers, record calls, and receive voicemails as text. This app provides a solution for unwanted and harassing calls.

What We Love

  • 🔒 Effective in unmasking blocked numbers
  • 🚀 Able to record and transcribe calls
  • 👍 Helpful in gathering evidence for legal issues

Room to Improve

  • 🐛 Inaccurate caller ID information
  • 🔒 Difficult to fully deactivate and remove from device
  • 🔋 Continued call forwarding even after cancellation
Verizon Call Filter#3

Verizon Call Filter by Verizon Wireless

Put an end to mystery calls
Worth Considering
🔧 Utilities
4.7😐(300K ratings)
Free
Verizon Call Filter screenshot 1
Verizon Call Filter screenshot 2
Verizon Call Filter screenshot 3
Verizon Call Filter screenshot 4
Verizon Call Filter screenshot 5

This app helps you identify and block unwanted spam and robocalls. It automatically screens incoming calls, alerts you to suspected spam, and can send high-risk callers directly to voicemail. You can also report spam numbers and customize your blocking preferences for greater control over your calls.

What We Love

  • 🚀 Blocks spam calls
  • 🔒 Helps reduce spam
  • 👍 Works well for some users
  • ⭐️ Useful tool

Room to Improve

  • 🐛 Doesn't block all spam calls
  • 🔒 Blocks legitimate calls
  • 💰 Paid version required for full functionality

More Block Unknown Callers Free apps to explore

4
T-Mobile Scam Shield
T-Mobile Scam Shield
T-Mobile Scam Shield
Your call control center.
Free

This app provides advanced call management features to protect you from unwanted scam and robo calls. It uses AI and machine learning to identify and block suspicious numbers, offers full caller ID, and allows you to report fraudulent calls.

Scam BlockScam ReportingCaller ID
🔧 Utilities
(208K)
free
5
Truecaller: Premium Caller ID
Truecaller: Premium Caller ID
Truecaller: Premium Caller ID
Spam & Scam Phone Call Blocker
Free

Identify unknown callers and block spam calls and texts. This app uses AI and community data to screen calls, identify callers, and offers an AI assistant for call screening. Premium features include ad removal, unlimited lookups, and profile insights.

Identify unknown callersBlock spam calls and SMSAI-powered call screening
🔧 Utilities
(252K)
free with in-app purchases
6
Hiya: Spam Blocker
Hiya: Spam Blocker
Hiya: Spam Blocker
AI fraud & spam protection
Free

Block unwanted spam and scam calls while identifying unknown callers. Get real-time caller ID and call reasons before you answer, and protect your voicemail from spam. Offers premium features for an enhanced calling experience.

Spam and scam call blockingReal-time caller IDCall reason identification
🔧 Utilities
(237K)
free with in-app purchases
7
Easy Caller ID
Easy Caller ID
Easy Caller ID
Spam Blocker for Unknown Calls
Free

Identify unknown callers and block spam calls with real-time information displayed on your native call screen. Instantly look up any phone number to find caller details and enrich your address book. Your privacy is protected, and all features are completely free.

Instant caller identificationReal-time call screen displayPowerful spam call blocking
📊 Productivity
(2.7K)
free
8
True CallerID: Spam Blocker
True CallerID: Spam Blocker
True CallerID: Spam Blocker
Identify unknown calls & spam
Free

Identify unknown callers and block unwanted calls automatically. This app uses smart spam detection and AI to protect you from robocalls, telemarketers, and scams. Take control of your phone and see caller information before you answer.

Instant Caller IDSmart Call BlockerSpam Detection Alerts
🔧 Utilities
(256)
free with in-app purchases
9
CallerIDBlock
CallerIDBlock
CallerIDBlock
by Balvant Manvar
Free
🌟 Lifestyle
(0)
10
Mr. Number Lookup & Call Block
Mr. Number Lookup & Call Block
Mr. Number Lookup & Call Block
Identify callers quickly
Free

Instantly identify unknown callers and block unwanted calls. This app provides lightning-fast phone number lookups, protects against scam calls, and offers advanced spam detection to keep your device free from robocalls. Manage your personal block list and report spam to help the community.

Identify unknown callersBlock specific phone numbersSpam detection and blocking
🔧 Utilities
(100K)
free with in-app purchases
11
CallFort
CallFort
CallFort
Stop SPAM Calls Now!
Free

This app uses advanced AI to block spam and scam calls before they ring, ensuring you only receive important calls. It offers a privacy-first design and allows you to set specific working hours for call screening. Protect yourself and your family from unwanted interruptions.

Blocks spam and scam callsAI-powered real-time adaptationScreens unknown callers
🔧 Utilities
(10)
free with in-app purchases
12
Call ID - Call Blocker
Call ID - Call Blocker
Call ID - Call Blocker
Verified Caller, Block Spamers
Free

Identify unknown callers in real-time and block unwanted numbers before they ring. This app uses a local database of known spam numbers and community reports to protect you from robocalls, telemarketers, and scams. Enjoy uninterrupted calls and enhanced privacy.

Live Caller ID for unknown numbersBlock robocalls, telemarketers, and scamsLocal database of 14,000+ spam numbers
🔧 Utilities
(8K)
free with in-app purchases
13
Spam Call Blocker • Caller ID
Spam Call Blocker • Caller ID
Spam Call Blocker • Caller ID
Stop Robocalls & SMS Filter
Free

Instantly block unwanted calls and filter spam texts with advanced detection technology. Identify unknown callers in real-time and protect your personal data with a privacy-first design. Enjoy a cleaner, safer communication experience.

Automatic call blockingReal-time caller IDIntelligent SMS filtering
🔧 Utilities
(2)
free with in-app purchases
14
Prefixly - Block Spam Calls
Prefixly - Block Spam Calls
Prefixly - Block Spam Calls
Block spam calls by prefix
Free
🔧 Utilities
(0)
15
telGuarder
telGuarder
telGuarder
by Telguarder AS
Free

Block unwanted calls and identify unknown numbers. This app uses a community-powered database to warn you about spam and allows you to look up call statistics for any number directly from your call history.

Spam call alertsCommunity-supported spam listCaller number lookup
🔧 Utilities
(0)
free
16
Hunt Contact
Hunt Contact
Hunt Contact
Who Calls Me?
Free

Identify unknown callers and block spam with this app. It provides instant information on suspicious numbers, including suggested names, reviews, and activity. Access organization details and telecom data to protect yourself from unwanted calls and scams.

Offline spam blockingSuspicious number identificationCaller reviews and tags
🔧 Utilities
(10)
subscription
17
Dual Tele ID Caller App Block
Dual Tele ID Caller App Block
Dual Tele ID Caller App Block
Use Dual Tele App & Spam calls
Free
🔧 Utilities
(0)
18
TraceID: Unmask & Block Calls
TraceID: Unmask & Block Calls
TraceID: Unmask & Block Calls
Reveal Unknown Phone Numbers
Free

This app acts as a shield against unwanted calls and texts, using AI and a global spam radar to identify and block scams. It can reveal the true number behind blocked or anonymous calls, helping you report harassment and regain control of your phone.

Real-time spam call protectionSpam text filteringReveal hidden callers
💼 Business
(3)
free with in-app purchases
19
CallingVault: 2nd Number
CallingVault: 2nd Number
CallingVault: 2nd Number
Safe...Secure...Private..
Free
🌐 Social Networking
(0)
20
Caller ID: spam call blocker
Caller ID: spam call blocker
Caller ID: spam call blocker
Reverse phone number lookup
Free
📊 Productivity
(0)

FAQ about Block Unknown Callers Free

What are the best block unknown callers free apps for iPhone?
Robokiller: Spam Call Blocker tops our block unknown callers free apps ranking as of August 2026, with a 4.5-star average from 414K App Store ratings, and it's free to download.
Robokiller: Spam Call Blocker has no ads and offers in-app purchases, according to its App Store listing as of August 2026.
We track 249+ block unknown callers free apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
Robokiller is designed to eliminate up to 99% of spam calls and text messages. It uses a global database of known spam numbers and AI-powered audio fingerprinting to identify and block unwanted communications. The app also offers features to annoy spammers and protect your personal information.
It employs a multi-pronged approach. A global database of 1.4 billion analyzed calls instantly protects against known scams. Additionally, patented audio fingerprinting technology uses machine learning to identify and block annoying, unwanted calls before they ring your phone.