Best Desy Phone Book Apps

238+ iOS apps curated and reviewed

4.2 avg rating

20 free apps

Updated October 2026

If you already know DESY Phone Book, this is the deeper bench. 238+ desy phone book apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of October 2026.

Compare top Desy Phone Book Apps (October 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	DESY Phone Book	Free	—	No	No	May 2026
2	CallGenius	Free	4.7★ (27)	No	Yes	Oct 2026
3	Easy Phone Book for Seniors	Free	4.4★ (18)	No	Yes	Aug 2026
4	SmartLine Second Phone Number	Free	4.7★ (44K)	No	No	Oct 2026
5	2Phone: Second Phone Number	Free	1.0★ (1)	No	Yes	May 2026
6	WhoU - Reverse Phone Lookup	Free	5.0★ (1)	No	Yes	Aug 2026
7	Text Us : Second Phone Number	Free	4.7★ (37)	Yes	No	Oct 2026
8	2nd Line Phone Number	Free	5.0★ (1)	Yes	No	Oct 2026

Top Picks for Desy Phone Book

#1

DESY Phone Book by Deutsches Elektronen-Synchrotron DESY

Editor's Choice

0.0(0 ratings)

Free

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#2

CallGenius by InnoCore Limited

Reverse Phone Lookup

Strong Contender

4.7(27 ratings)

FreeIn-App Purchases

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Instantly identify unknown callers and retrieve contact details by entering any phone number. Access a global database and utilize an AI assistant for further information. Manage your subscription easily through account settings.

#3

Easy Phone Book for Seniors by Hemant Bhonsle

Big Button Contacts Dialer

Worth Considering

4.4(18 ratings)

FreeIn-App Purchases

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This app offers a simplified contact management experience with large, easy-to-read text and buttons. It prioritizes quick access to calling and messaging, with options to pin important contacts and toggle photos for a clutter-free interface. Designed for enhanced usability and privacy, all data stays on your device.

More Desy Phone Book apps to explore

SmartLine Second Phone Number

SmartLine Second Phone Number

SmartLine Second Phone Number

2nd phone number for business

Get a dedicated second phone number for your business to maintain privacy and professionalism. This app ensures calls are business-related, offers a spam filter, custom voicemail, and voicemail-to-text transcription. Manage your business communications efficiently with organized history and timely notifications.

Dedicated business phone numberProfessional call quality (not VoIP)Spam call filtering

2Phone: Second Phone Number

2Phone: Second Phone Number

2Phone: Second Phone Number

Calls & Text On 2Number Line

Easily manage a second phone line for enhanced privacy and communication separation. Obtain a new number without needing an extra device, ideal for professionals, travelers, and online interactions.

Select a second phone numberUnlimited texts and callsGuaranteed privacy

🌐 Social Networking

free with in-app purchases

WhoU - Reverse Phone Lookup

WhoU - Reverse Phone Lookup

WhoU - Reverse Phone Lookup

Phone number lookup app

Identify unknown callers and texters by performing a reverse phone number lookup. This app searches public databases to reveal line type, carrier, and area information for any number.

Reverse phone number lookupReveal line type and carrierIdentify scammers and telemarketers

free with in-app purchases

Text Us : Second Phone Number

Text Us : Second Phone Number

Text Us : Second Phone Number

Second Number,Caller ID Lookup

Obtain a dedicated second phone number for personal, business, or travel needs. This app allows you to manage calls, contacts, and multiple numbers from one convenient location, enhancing your communication privacy and organization.

Second phone number acquisitionCaller ID lookupContact management

2nd Line Phone Number

2nd Line Phone Number

2nd Line Phone Number

Get a New Phone Number Fast

Get a new virtual phone number for calls and texts without needing a second device or SIM card. Choose a number from various countries and customize it to your preferences. Ideal for separating personal and business communications.

Get a new virtual phone numberWorks for calls and textsChoose numbers from multiple countries

Smarter voice calling

This app provides a dedicated phone number for calls, texts, and voicemail, syncing across devices for seamless use anywhere. It offers advanced spam filtering, call forwarding, and searchable message history. Voicemails are transcribed for easy reading and can be sent to your email.

Dedicated phone numberCall, text, and voicemailCross-device syncing

📊 Productivity

Reverse Phone Number Lookup

Identify unknown callers by performing reverse phone number lookups. Enter a number to find the associated name or location. Supports US/CA numbers and allows users to report spam to improve accuracy.

Reverse phone number lookupIdentify unknown callersSupports cell and land lines

Reverse Lookup ®

Reverse Lookup ®

Reverse Lookup ®

Phone lookup, ture caller id

Identify and block unwanted spam calls and messages with a global number database. Detect unknown callers and look up number details anonymously. No registration is required for unlimited queries.

Spam call and message blockingUnknown call detectionNumber information lookup

free with in-app purchases

Number Lookup ：Number Book

Number Lookup ：Number Book

Number Lookup ：Number Book

Get Caller's Name & Block Spam

Identify unknown callers and block spam with a comprehensive global number database. This app offers anonymous searches, effortless contact management, and instant search history saving. Stay informed and protected from scams with a user-friendly interface.

Comprehensive number lookupSpam call detectionAnonymous searches

Reverse Phone Lookup ·

Reverse Phone Lookup ·

Reverse Phone Lookup ·

Number book, caller id

Identify unknown callers and block spam or scam calls. This app provides threat levels for unknown numbers, revealing their true name and location. Search a vast database to avoid annoying calls and protect yourself.

Identify unknown callsBlock spam & scam callsThreat level of unknown numbers

free with in-app purchases

Second Phone Number # 2nd Line

Second Phone Number # 2nd Line

Second Phone Number # 2nd Line

Unlimited Text & Call Landline

🌐 Social Networking

Phone Call - Caller ID

Phone Call - Caller ID

Phone Call - Caller ID

Identify unknown callers and block unwanted calls with this powerful tool. It functions as a phone number lookup, spam blocker, and smart dialer, helping you see the true caller ID and region for every incoming call. Over 30 million users trust it to screen their calls.

Instant Caller ID identificationPhone number lookupSpam and unwanted call blocking

Phone Number Lookup-Caller ID

Phone Number Lookup-Caller ID

Phone Number Lookup-Caller ID

Reveal true caller & trap call

Identify unknown callers and block unwanted calls with this powerful tool. It provides detailed information on any phone number worldwide, helping you avoid spam and scams. Manage your contacts, filter junk texts, and keep important information secure.

Global phone number lookupReverse phone lookupContact management

free with in-app purchases

Second Phone Number 2nd Line

Second Phone Number 2nd Line

Second Phone Number 2nd Line

by MindSpark Studio LLC

Corporate Phone

Corporate Phone

Corporate Phone

by Corporate Tools LLC

Get a second phone number that routes to your existing device, offering unlimited calling and texting. Protect your personal number from unwanted contacts and choose your own U.S. area code. Features include custom voicemail, spam blocking, and a contacts manager.

Second phone numberUnlimited calling and textingChoose U.S. area code

by Moisey Simolin

Manage contacts, secure passwords, and identify callers with this communication assistant. It offers smart contact organization, a robust password manager, and caller ID with blocking capabilities for enhanced control over your digital interactions.

Smart contact list with international number recognitionCustomizable contact fieldsSecure password manager with color-coded tags

Private: Second Phone Number

Private: Second Phone Number

Private: Second Phone Number

2nd Second Number Phone Line

FAQ about Desy Phone Book

Are there free desy phone book apps for iPhone?

Yes — 20 of the top desy phone book apps we rank are free to download, including DESY Phone Book and CallGenius.

Does DESY Phone Book have ads or in-app purchases?

DESY Phone Book has no ads and has no in-app purchases, according to its App Store listing as of October 2026.

How many desy phone book apps are on the App Store?

We track 238+ desy phone book apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.