Best Unknown Caller Identifier Apps

229+ iOS apps curated and reviewed

3.9 avg rating
20 free apps
Updated September 2026

Looking for free unknown caller identifier apps? 20 of our 229+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Compare top Unknown Caller Identifier Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1CallerID: True Number SearchCallerID: True Number SearchFree4.2★ (75)NoYesSep 2026
2True CallerID: Spam BlockerTrue CallerID: Spam BlockerFree4.3★ (261)NoYesSep 2026
3Caller True ID & Find NumberCaller True ID & Find NumberFree5.0★ (2)YesYesAug 2026
4ContactFinder - Caller IDContactFinder - Caller IDFree1.0★ (1)NoYesAug 2026
5NumberBox:CallerIDNumberBox:CallerIDFree4.5★ (465)NoNoSep 2026
6Caller-IDCaller-IDFree3.7★ (19K)NoYesSep 2026
7Show Caller ID & Spam BlockerShow Caller ID & Spam BlockerFree4.1★ (306)YesYesSep 2026
8ViewCaller: Caller IDViewCaller: Caller IDFree4.1★ (776)NoYesSep 2026

Top Picks for Unknown Caller Identifier

CallerID: True Number Search#1

CallerID: True Number Search by Stephen Kuyper

Reverse Search & Spam Blocker
Editor's Choice
🔧 Utilities
4.2(75 ratings)
FreeIn-App Purchases
CallerID: True Number Search screenshot 1
CallerID: True Number Search screenshot 2
CallerID: True Number Search screenshot 3
CallerID: True Number Search screenshot 4
CallerID: True Number Search screenshot 5
CallerID: True Number Search screenshot 6

Instantly identify unknown callers and block spam, scams, and robocalls. This app offers reverse number lookup, SMS spam protection, and customizable blacklists for enhanced phone security and privacy.

True CallerID: Spam Blocker#2

True CallerID: Spam Blocker by Reena Williams

Identify unknown calls & spam
Strong Contender
🔧 Utilities
4.3(261 ratings)
FreeIn-App Purchases
True CallerID: Spam Blocker screenshot 1
True CallerID: Spam Blocker screenshot 2
True CallerID: Spam Blocker screenshot 3
True CallerID: Spam Blocker screenshot 4
True CallerID: Spam Blocker screenshot 5
True CallerID: Spam Blocker screenshot 6

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.

Caller True ID & Find Number#3

Caller True ID & Find Number by Surbhiben Savaliya

Identify Callers, Find Numbers
Worth Considering
📊 Productivity
5.0(2 ratings)
FreeAdsIn-App Purchases
Caller True ID & Find Number screenshot 1
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Caller True ID & Find Number screenshot 6

Identify unknown callers and search phone numbers with a clear interface. Get quick access to caller information and look up numbers to understand who is contacting you. Convenient tools help you manage contacts and review incoming calls easily.

More Unknown Caller Identifier apps to explore

FAQ about Unknown Caller Identifier

What are the best unknown caller identifier apps for iPhone?
CallerID: True Number Search tops our unknown caller identifier apps ranking as of September 2026, with a 4.2-star average from 75 App Store ratings, and it's free to download.
Yes — 20 of the top unknown caller identifier apps we rank are free to download, including CallerID: True Number Search and True CallerID: Spam Blocker.
CallerID: True Number Search has no ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 229+ unknown caller identifier apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
CallerID: True Number Search is a utility app designed to identify unknown callers and block spam, scams, and robocalls. It provides features like reverse number lookup and SMS spam protection to enhance phone security.
The app automatically blocks telemarketers, robocalls, and fraud numbers. It also offers SMS spam protection to detect and block spam text messages, and provides instant warnings about high-risk calls.