Phonebook Navigator is a free app that displays information retrieved from the app, even for numbers not registered on your smartphone. Its vast amount of information provides highly accurate detection, even compared to carrier-provided spam call blocking apps (paid), displaying not only spam calls but also information from businesses and public institutions. (The app detects over 200 million calls per month.)
The SMS filtering feature, which prevents phishing scams, is also available free of charge. Phonebook Navigator's SMS filtering function is highly effective in preventing information leaks and is used by many government agencies and corporations. (We also work with prefectural police and local governments.)

[Important] If your phone is set to use data for voice calls, the caller ID display will not be available. (See bottom of page.)
[Important] The safety of Phonebook Navigator is explained at the bottom of the page (please see for details if you have safety concerns).

[Required Settings]
To comply with the latest Google Play policies, Phonebook Navigator must be set as a caller ID/spam call app on Android 10 or later. This will enable the caller ID display and blocking features.

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About Telephone Book Navi
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●Telephone Book Navi is one of Japan's largest telephone number information sites, with over 30 million monthly users. It also boasts the largest domestic market share for its phone number identification app (over 200 million calls are identified via the app each month).
Since 2008, Telephone Book Navi has specialized in phone number analysis for approximately 17 years, and is an expert who has identified over 23 billion phone numbers both in Japan and overseas. Only Telephone Book Navi can identify phone numbers with an overwhelming amount of information and the latest analysis technology.
Enjoy peace of mind and safety with the free Telephone Book Navi.

- No. 1 in Japan for free number identification app users
- No. 1 in Japan for phone number information site users
- No. 1 in Japan for number of registered phone numbers
- No. 1 in Google Play's popular communication app category (July 2024)

● Denwacho Navi uses AI analysis technology to collect, analyze, register, and block signals provided by tens of millions of users in real time.

● Phone numbers for couriers and recruiters are also registered, making it easy to identify calls you should answer.
The app is easy to use; simply tap the icon after installation to launch it. When a call comes in, it automatically searches for the phone number and displays it on the screen along with the level of inconvenience.
*Approximately 90% of Japan's courier companies are registered.

● Denwacho Navi's number identification service is widely used by government agencies and companies.

● Denwacho Navi detects phone numbers used by fraudulent crimes faster than police agencies.
This information is extremely useful for preventing crime.
Installing Denwacho Navi in advance is an effective crime prevention measure.

● Installing Phonebook Navigator is also an effective crime prevention measure.
It is most important to not accept calls from scammers and criminals.
Phonebook Navigator blocks phone numbers used for criminal activities such as bank transfer scams, fictitious billing, and illegal finance.

● Calls received on landlines can also be forwarded to your mobile phone, making it possible to identify the caller.
*Please forward calls to a smartphone with Phonebook Navigator installed.
By using this method to handle landline calls as well, you can block scam and nuisance calls before they occur.
We strongly recommend forwarding calls from landlines to smartphones, as this is a strong crime prevention measure for elderly households.

● Phonebook Navigator displays a "nuisance call rating" calculated from app users.
Graphs allow you to intuitively decide whether to reject the call or whether it is a call that needs to be answered.

● Reviews posted by other users are displayed when a call comes in.
When a delivery person contacts you to check on your presence, the delivery driver's phone number is usually not registered on your device, so only their phone number is displayed. However, if you install the Phonebook Navigator, the number will be displayed as "XX Delivery Driver."

●Since the Phonebook Navigator is used by many users, it also functions effectively as a business card for the caller.
By letting the recipient know your company name and business details before answering, you can reassure them and increase response rates.
For more information, see Enterprise Services (Caller Features) in the app menu.

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If you make an in-app purchase
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The following features are available by purchasing the in-app purchase (Premium Version).
- Automatic call blocking for nuisance calls
* The free version alerts you to danger but does not automatically block calls.
* Unlimited call history (you can search back through past calls)
* The free version has a history limit of 30 calls.
* Ability to hide in-app ads
* Ability to cancel the call judgment screen after ending a call
* View more detailed information on the details screen.

[Important] If you make an in-app purchase, please configure call blocking settings in the settings screen.

* Please confirm that the free version works as expected before purchasing. Refunds are not available after purchase.
* Users can manage their purchases by going to Play Store > Settings > Payment & Subscriptions > Subscription Settings.

* Why we recommend the paid option:
This option automatically blocks scam and solicitation calls, making it especially recommended for seniors.

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About the app's core functionality
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The Telephone Navigation app provides the "Caller ID, Spam Detection, and Spam Blocking" features.
1. Phone number (incoming number)
2. Call history
3. App crash log data
4. Identifiers related to each device, browser, and app
Data 1 through 4 above are sent to the Telephone Navigation server (telnavi.jp).
*All sent information is encrypted using SSL.
*After a call ends, you can manually send the caller's phone number, review information, and spam rating to the Telephone Navigation server to provide the app and service's essential functions. This information is shared with third parties other than the app provider. (SMS rating information is not disclosed.)

[How to disable pop-ups (foreground service)]
You can disable pop-ups by turning off both "Show information when receiving a call" and "Show information when making a call" in the settings screen. This will stop the foreground service.

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Inquiries
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If you encounter any issues, please contact us through the app's Menu > Settings > Report a Problem. Our support team will help you resolve the issue.

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Important Information
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●Incoming Call Display Does Not Work with Data Calls
Calls made over data communication are not made over a telephone line, so the incoming call display will not work. Rakuten Link and MVNO plans include services that allow voice calls over data communication, but in these cases, the incoming call display will not work. Please confirm that your SIM contract plan uses a "telephone line" for calls (support cannot answer questions regarding SIM plans).

● About the Safety of the Phonebook Navigation App [Important]
The Phonebook Navigation app is designed to "not identify calls as spam" when they come from phone numbers stored in the device's phonebook (contacts). (This is because phone numbers stored in the contacts are considered important contacts for the user.) To achieve this, the app accesses the phonebook (contacts) for verification purposes only when a call comes in. (Used only on the device.)

Google Play's app review process is currently very strict, with particularly strict rules regarding the handling of privacy data.
Apps that request unnecessary permissions or do not properly handle personal information within the app will not pass review and will not be released. The Phonebook Navigation app is released in compliance with the Google Play Developer Policy.

It's easy to see why Phonebook Navigation is used by many government agencies and companies.
Phonebook Navigation provides the highest level of safety and security for your smartphone.

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