Best Unknown Caller Identifier Apps

234+ iOS apps curated and reviewed

4.0 avg rating
20 free apps
Updated October 2026

Looking for free unknown caller identifier apps? 20 of our 234+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Compare top Unknown Caller Identifier Apps (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Truecaller ~ Caller ID & BlockTruecaller ~ Caller ID & BlockFree—YesYesOct 2026
2True CallerID: Spam BlockerTrue CallerID: Spam BlockerFree4.3★ (308)NoYesOct 2026
3Caller-IDCaller-IDFree3.7★ (19K)NoYesNov 2026
4NumberBox:CallerIDNumberBox:CallerIDFree4.5★ (566)NoNoOct 2026
5ViewCaller: Caller IDViewCaller: Caller IDFree4.1★ (799)NoYesOct 2026
6True Caller - Number TrackerTrue Caller - Number TrackerFree3.0★ (2)YesYesSep 2026
7ContactFinder - Caller IDContactFinder - Caller IDFree3.0★ (2)NoYesOct 2026
8Infgety: CallerID & NumberBookInfgety: CallerID & NumberBookFree4.3★ (364)YesYesOct 2026

Top Picks for Unknown Caller Identifier

True CallerID: Spam Blocker#2

True CallerID: Spam Blocker by Reena Williams

Identify unknown calls & spam
Strong Contender
🔧 Utilities
4.3(308 ratings)
FreeIn-App Purchases
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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-ID#3

Caller-ID by Greenflight Venture Corporation

Reverse Phone Lookup
Worth Considering
🔍 Reference
3.7😞(19K ratings)
FreeIn-App Purchases
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Caller-ID screenshot 6

Identify unknown callers and find out who owns a phone number. This app offers a global reverse lookup for over 1 billion numbers, with features like geolocation and social media directory integration. It also allows users to report and comment on spam or prank callers.

What We Love

  • 💯 Accurate caller identification
  • 🔍 Helpful for screening calls
  • 🔍 Useful for finding unknown numbers

Room to Improve

  • 🐛 Doesn't work consistently
  • 🔍 Limited information provided
  • 💰 Misleading about free features

More Unknown Caller Identifier apps to explore

FAQ about Unknown Caller Identifier

Are there free unknown caller identifier apps for iPhone?
Yes — 20 of the top unknown caller identifier apps we rank are free to download, including Truecaller ~ Caller ID & Block and True CallerID: Spam Blocker.
Truecaller ~ Caller ID & Block shows ads and offers in-app purchases, according to its App Store listing as of October 2026.
We track 234+ unknown caller identifier apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.