Spam calls, scammers and annoying marketers turn your smartphone into a source of stress. According to Kaspersky, in 2023, every third Android user received unwanted calls every week. Fortunately, modern versions of the operating system and smartphone manufacturers offer several levels of protection - from built-in functions to third-party applications with artificial intelligence.

In this article we will analyze all working methods for blocking unfamiliar numbersincluding hidden Android settings, proprietary solutions Samsung, Xiaomi, Google and even the capabilities of mobile operators. You'll learn how to filter out spam without losing important calls, set up a whitelist of contacts, and automatically send scammers to voicemail. And for advanced users - instructions for working with ADB for deep customization.

1. Built-in blocking in Android: configuration via “Phone”

Basic functionality for filtering calls is available in the standard application Phone on all devices with Android 9+. This method does not require the installation of additional software and works on “pure” Android (for example, Google Pixel), as well as on most proprietary shells.

To activate filtering:

  1. Open the application Phone (handset icon on the main screen).
  2. Tap on the three-dot menu (⋮) in the upper right corner.
  3. Select Settings → Blocking numbers and spam (on some devices the item may be called Spam protection or Call filtering).
  4. Turn on the switch Filter spam calls.
  5. Optional: add numbers manually via Add number or activate Unknown numbers to block all unsaved contacts.

On smartphones Samsung Galaxy the path is slightly different: Phone → ⋮ → Settings → Block numbers. Here you can enable the option Block unknown numbers and add exceptions for important contacts. Important: on some Samsung models, after blocking an unknown number, the subscriber will hear the message “Subscriber is temporarily unavailable” rather than the standard busy signal.

📊 How often do you get calls from unfamiliar numbers?
Daily
Several times a day week
Rarely
Never

2. Branded solutions from manufacturers: Samsung, Xiaomi, Huawei

Smartphone manufacturers often expand the standard capabilities of Android with their own tools.

Brand Path to settings Unique features Restrictions
Samsung (One UI) Phone → ⋮ → Settings → Blocking numbers Automatic detection of fraudulent numbers through the database Samsung Smart Call Requires an Internet connection to work Smart Call
Xiaomi (MIUI) Phone → ⚙️ → Blocking and filtering → Spam settings Built-in "Black list" with the ability to block by number prefix Function Block unknown can trigger important calls from banks
Huawei (EMUI) Phone → ⋮ → Blocking → Blocking settings Do Not Disturb mode with flexible rules for unknown numbers No integration with third-party spam number databases
Google Pixel (Stock Android) Phone → ⋮ → Settings → Spam and blocking Integration with Google Call Screen (automatic answer and filtering) Call Screen works only in some countries

On devices Xiaomi there is an additional option Filter by keywords in the spam settings For example, you can block all calls from numbers containing combinations like 900 (banking services) or 495 (Moscow numbers). This is useful if collectors or marketers from a specific region are harassing you.

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On Samsung smartphones, activate Smart Call in the blocking settings - the system will automatically mark potentially dangerous numbers as “Suspicious” or “Fraud” even before answering.

3. Applications for blocking calls: TOP-5 solutions

If the built-in tools are not enough, third-party applications offer advanced functionality: cloud databases of spam numbers, analysis of subscriber behavior, and even automatic addition of scammers to the blacklist. Here are the proven ones. solutions:

  • 🛡️ Truecaller —market leader with a database of >300 million numbers. Detects spam before a call, supports SMS blocking. Minus: requires registration and access to contacts.
  • 🔍 Hiya — specializes in fraudulent calls, integrates with operator services databases. There is a reverse number search function.
  • 📱 Should I Answer? - analyzes the subscriber's behavior (for example, call frequency) and blocks suspicious numbers automatically.
  • 🌍 Sync.ME - in addition to blocking, shows the social profiles of callers (if they are linked to the number).
  • 🔒 Blacklist Plus - a simple application without cloud databases, but with flexible rules for local black calls. list.

To install any of these applications, go to Google Play → find the name → Install. After installation, do not forget to provide permissions to access calls and contacts (this is necessary for correct operation).

⚠️ Attention: some applications (for example, Truecallerupload your contacts to their servers to improve the database. If this is critical for privacy, use offline solutions like Blacklist Plus.

Enable spam call blocking in settings|Activate the "Automatic blocking" option|Add important numbers to the "White List"|Disable notifications about blocked calls calls (optional)-->

4. Blocking at the operator level: MTS, Beeline, Megafon, Tele2

Mobile operators offer their own spam filtering services. These solutions work at the network level, so they block calls even before they reach your smartphone. Services are usually free or cost a nominal fee (1-5 rubles per month). day).

You can activate the protection:

  • 📞 Via USSD commands:
    • MTS: dial *111*789# and follow the instructions.
    • Beeline: send an SMS with the text PROTECTION to the number 5166.
    • Megafon: dial *105*400#.
    • Tele2: activate the "Spam Protection" option in your personal account.
  • 🌐 Through your personal account on the operator's website (section "Services" or "Security").
  • 📱 Through the operator's official application (for example, My MTS, My Beeline).

The advantage of operator blocking is that it works even if the phone is turned off or is outside the network coverage area. However, the service has limitations: for example, it does not block calls from numbers registered as “banking” or “state.”

⚠️ Attention: operators can change the terms of service. Before activation, check the tariffs and filtering rules on the official website or through support (for example, 0890 for MTS, 0611 for Beeline).

5. contacts

Function Do not disturb (DND) in Android allows you to completely turn off all notifications and calls, except those that are in the "white list". This is a radical but effective way to get rid of unfamiliar callers.

How configure:

  1. Go to Settings → Sound → Do Not Disturb.
  2. Turn on the mode Do Not Disturb.
  3. Select Calls and set the option Contacts only or Favorite contacts.
  4. In section Exceptions Add important numbers (for example, a bank or delivery service) that are not saved in the phone book.
  5. Activate the schedule if you want to turn on the mode automatically (for example, at night).

On Samsung Galaxy similar the functionality is called Do not disturb mode and is located in Settings → Notifications → Do not disturb mode. Here you can create several profiles with different rules (for example, separately for work and sleep).

What to do if an important call did not go through DND?

If you missed an important call due to Do Not Disturb mode, check:

1. Have you added the number to exceptions (manually or through a contact group).

2. Did the automatic rule work (for example, “Only by schedule”).

3. Is there a conflict with other applications (for example, Truecaller can intercept calls before DND).

If the problem persists, try disabling third-party calling applications or reset DND settings to default.

6. Advanced methods: ADB and Android customization

For users with root access or an unlocked bootloader, deep settings are available through ADB (Android Debug Bridge). This method allows you to block unknown numbers at the system level, bypassing the limitations of standard tools.

Instructions for experienced users:

  1. Install Platform Tools on your PC (download from the website Android Developers).
  2. Connect your smartphone to your computer and activate USB debugging in Settings → About phone → Build number (tap 7 times to unlock developer mode).
  3. Open command line (Windows) or terminal (macOS/Linux) and run:
adb shell settings put global block_unknown_callers 1

This command will enable blocking of unknown numbers at the system level. To cancel the action, replace 1 with 0.

For more detailed settings, you can use Xposed Framework (requires root) with module Call Blocker. This will allow you to create complex filtering rules, for example, blocking numbers by geolocation or time of day.

⚠️ Attention: incorrect use ADB or changing system files can lead to malfunctions of the phone Before experiments, create a backup copy of your data via Settings → System → Backup.
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Methods via ADB or root are suitable only for experienced users. For most tasks, built-in Android tools or third-party applications are sufficient.

7. Alternative methods: second number and virtual SIM

If it is important for you to stay. to stay in touch, but at the same time avoid spam, consider the following options:

  • 📱 Second physical number: use the second SIM card slot for work or personal contacts, and leave the main number for registration in services. Samsung Galaxy and Xiaomi you can set up separate profiles for each SIM.
  • 🌐 Virtual numbers: services like Google Voice (available in some countries) or Dingtone allow you to get a temporary number for calls. Spam will be sent to a virtual line, and the main number will remain clean.
  • 🔄 Call forwarding: set up forwarding from the main number to the second one via USSD commands (for example, 21[number]# for Megafon). Spam will go to the backup line.

For business users, a solution from Yandex.Telephony or Mango Office is suitable - these services offer “smart” call routing with spam filtering at the cloud level PBX.

FAQ: Frequently asked questions about blocking unknown numbers

Can blocked subscribers find out that their number is blacklisted?

No, most smartphones have a blocked subscriber will hear standard beeps or the message “Subscriber is temporarily unavailable.” An exception is that some operators (for example, MTS) can send an SMS notification about blocking if this option is activated in your personal account.

Why are bank calls also blocked as spam?

Banks often use short numbers (for example, 900) or virtual lines that fall under filters. To avoid this, add official bank numbers in White list in the blocking settings or in the filter application (for example, Truecaller).

How block calls from hidden numbers?

Hidden numbers (displayed as "Unknown" or "Private") are blocked through the app settings Phone:

  1. Open Phone → ⋮ → Settings → Block numbers.
  2. Enable the option Block hidden numbers (on Xiaomi — Block private numbers).

On some devices this function may not be available - in this case use applications like Should I Answer?that can filter hidden calls.

Will blocking work if the phone is in airplane mode?

No, in airplane mode all calls (including spam) are blocked at the network level. However, if you enable Wi-Fi calls (Settings → Network and Internet → Wi-Fi calls), then filtering will work according to the same rules as for the mobile network.

Is it possible to return a blocked call?

If a call was blocked by the system or application, it will go into the log as missed (usually marked “Blocked”). On Samsung and Google Pixel you can listen to the voice message (if the subscriber left one) in the Voicemailsection. It is impossible to return the call itself, but you can add the number to the white list and call back.