Useful Tips

How to use telephone directory apps for research


Thanks to smartphones based on android, keeping in touch with family and friends has become easier.

However, not only those we love and respect can call us. Sometimes they are spammers, sometimes strangers, sometimes telemarketers and other undesirable subjects. You must not suffer from them!

This guide will show you how to block numbers on Android phones.

How to block a number on a clean Android

Do you have a Nexus 6P or Nexus 5X with the original android? There are two ways to block you - open the call application and go to the tab with the latest calls. Hold the number and select Block.

The second method is as follows - open the application for calls and select the menu with three dots in the upper right corner, then Settings. Find Call Blocker and add an unwanted number.

How to block a number on a Samsung smartphone

Samsung is the largest manufacturer of Android smartphones. Below is an instruction on how to block numbers on these phones:

  1. Open the call app.
  2. Select the number you want to block and select More details (icon in the upper right corner).
  3. Select Add to blacklist.
  4. To delete the number for other settings, go to Settings> Call settings> All calls> Block

How to block number on LG smartphone

Here you will need to perform almost the same steps:

  1. Open the call app.
  2. Click More details (icon in the upper right corner).
  3. Select Call settings.
  4. Select Add to blacklist.
  5. Click the “+” button and add a number.

How to block number on HTC smartphone

  1. Open the call app.
  2. Press and hold the number.
  3. Select Block contact.
  4. Click OK.
  5. The phone can be removed from the blacklist in the People application.

Third-party number blocking applications

If your Android smartphone does not have a built-in lock function, you can download the lock application on Google Play. The following are worth mentioning separately: Number, Call Blocker, and Calls Blacklist.

Mr. application Number allows you to block unwanted numbers, and there is no advertising in it. It also protects against spam, can mute individual contacts and even make the phone inaccessible to the whole world.

Here is a rough guide to using Mr. Number:

1. Download, install and run the Mr. application Number Click OK to continue.
2. Select your country and enter your number. Click OK to continue.
3. To start blocking contacts, click “No” or the lock icon in the upper right corner of the screen, where you can edit the black list.

There are three tabs here: Put the phone down, Voice mail and Exceptions.

When adding a contact to the list Put the phone down, your phone will automatically pick up the phone when this contact calls you.

Subscribers entered in the tab Voicemail can only leave you voice messages. You can add numbers in various ways.

1. Spam
2. All private / blocked numbers
3. Choose from recent calls or SMS
4. Enter the number
5. Select a number from the notebook
6. All numbers not in the notebook
7. All numbers starting with ...
8. All numbers in the notebook
9. All numbers

Tab Exceptions contains contacts that will not be blocked. So if you want to stay in touch with family and friends, so that no spammers call you, add the allowed numbers to Exceptions.

You can block contacts from the main screen of the application. Go to the tab Call log, which shows the history of calls and SMS, click Menu at the unwanted number and select Block number.

A pop-up window will appear asking if you want to block the contact or redirect it to voicemail. You can also mark it as spam and add your own comment.

Each lock will display a notification. In the application, you can also see the history of blocked calls in the corresponding tab.

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Arik Toler has been with Bellingcat since 2015. Among other things, it checks news published in the Russian media, studies the conflict in eastern Ukraine, analyzes Russian influence on the far right in the US and Europe, and continues to investigate the crash of the Malaysian Boeing.

Want to ask a question, share an idea for publishing, or write an article for Bellingcat? Contact Arik at the email address: arictoler (@) bellingcat (.) Com


Truecaller is the most popular application that allows you to find out who is calling from an unknown number. It can also block unwanted calls, completely protecting you from unnecessary calls. If the blocked subscriber tries to call you, he will hear a busy signal.

TrueCaller also allows you to search manually. Just enter the number and you will get the name attached to it, as well as some other information, for example, the name of the mobile operator. This is possible thanks to the huge database that contains information on billions of calls. For example, in India alone, the application employs 150 million people.

The app was originally developed for BlackBerry phones in 2009, by the Swedish company True Software Scandinavia AB, founded by Alan Mamedi and Nami Zarringhalam. From there, it quickly expanded to other platforms, including iOS and Android. And for 10 years now, the company has been collecting data on telephone numbers.

After installation, you will need to go through a quick registration through authorization using your Google, Facebook or Microsoft account. If you enable the “advanced search” option, Truecaller will look at your contact list and also add it to your database. In return, you will be able to find out how other users are recorded in the phone book.

Link to install on Android and iPhone.

CallApp allows you to identify unknown subscribers, block spam calls, record incoming and outgoing calls. At the same time, the identification of unknown numbers remains the main function, so it is not surprising that spam blocking does not work very well.

It is worth noting one more minus of CallApp - high energy consumption: when it is used, the smartphone’s battery is consumed faster than when working with Truecaller in the same conditions. Nevertheless, the application deserves a place in this list, since it copes well with its main task.

In addition to standard features, there is an “Incognito” mode with which you can hide the number of a specific subscriber, and it will not be displayed not only during an incoming call, but also in the call log. If suddenly, you have a person with whom you want to talk, but so that no one would know about it by taking your phone - this is what you need.

Link to install on Android.

Sync.ME has 10 million active users. It can block calls, ignore phone calls and identify unfamiliar numbers from around the world. In addition, it can determine the sender of the SMS and block it. SyncME supports reverse lookup for any phone number. There is a built-in reminder of birthdays, information about which is taken from social networks.

Link to install on Android and iPhone.

The main functionality of Drupe is identification of an unknown subscriber, recording telephone conversations, support for various design styles and blocking unwanted calls. Using Drupe, you can just dial a number, send a text message or contact someone from your contact list with your favorite messenger with just one flick of the finger.

The main emphasis was made by Drupe developers on the ability to communicate using gestures. You will always have at hand a transparent icon for quick access to contacts. WhatsApp, Facebook, Google Allo, SMS, and much more are supported, but if you do not upgrade to the premium version for $ 4, ads will be displayed in the contact list.

Link to install on Android and iPhone.

Show caller

Show Сaller is a small application that takes up only 4 MB, but nevertheless it is able to identify most unknown numbers and show detailed information about the subscriber, his name, photo, even if he is not in your contact list. Comes with support for T9 technology, which significantly speeds up the search for a notebook.

At the moment, the application has a base of about 20 million users. The Show Сaller interface is very similar to Truecaller, however, unlike the latter, it takes up much less space. Identification of subscribers is fast enough. Of the minuses, you can name only the presence of advertising.

Link to install on Android and iPhone.

Eyecon provides all possible information about an unknown or existing contact. Eyecon, thanks to synchronization with Facebook and other social networks, allows you to see a photo of the person who is calling you. Of course, if his account was found on Facebook.

There is a difference from other similar services: data is not searched by the database of phone numbers, but only through social networks. Thus, only users who already use Eyecon can be identified. Of the minuses, a small database should be mentioned in comparison with Truecaller. Service should be used only as a fallback.

Link to install on Android and iPhone.

Hiya, formerly known as Whitepages Caller Id, like Truecaller, detects unknown numbers and automatically blocks spam. The application is looking for information about the caller using its own database, which includes millions of phone numbers.

The app uses its huge database to identify over 400 million calls per month. In addition, Hiya also checks the contents of SMS messages for malicious links. Hiya has a chic design, does not show any advertising and it is free.

After installing the application, you will need to register using your Facebook account or email. When this happens, Hiya will be displayed on the incoming call screen and show all the information that can be found.

Fraudulent calls are displayed in red with a clearly visible warning sign, so you know that you do not need to spend time on it. The only problem is that sometimes it may take a few seconds before Hiya determines the caller, this is especially noticeable when using a slow Internet connection.

Link to install on Android and iPhone.

Mr. Number was created by the authors of the popular Hiya application, which was described above. It also recognizes spam and is able to block calls using prefixes. This means that you can block calls using area codes and operators. The application also identifies unknown subscribers, which helps fight stalkers.

The community is quite active, so you can comment on any number from which they call you, it is easy to add it to the white or black list. Support for reverse search is provided, which allows you to find out who called without waiting for a second call. Simply manually enter an unknown number in the search bar.

Link to install on Android and iPhone.

Whoscall was developed by Gogolook back in 2010 and during this time managed to assemble an impressive database of more than 700 million numbers worldwide, plus a community of 50 million users.

More than 20 million are detected using Whoscall per day and about 500 thousand calls are blocked. A key advantage of the service is its autonomous database, which allows you to identify the caller even without an Internet connection.

Link to install on Android and iPhone.

Have you ever received a call that says "Unknown"? Now you can identify any person who is hiding behind this faceless phrase. Trapcall offers what others cannot offer.

Most of these applications identify subscribers based on data from their own user base, while Trapcall detects calls even from private numbers. This feature will be especially useful for those pursued by stalkers: now collecting evidence to file a complaint with the police will not be difficult. When you switch to a professional plan, you get the opportunity to record calls, which will add evidence against your offender.