Anonymous calls are a real headache for smartphone owners. There is a flash of the screen, a vibration signal, but on the display instead of the subscriber’s name there is the inscription “Unknown number” or “Hidden number”. Most often, behind such calls there are unscrupulous marketers, scammers or simply obsessive individuals who want to disturb your peace of mind.
Fortunately, the operating system Android provides built-in mechanisms and tools to combat this scourge. You can completely cut off the flow of unwanted contacts without resorting to complex manipulations. In this article we will analyze all the available methods: from standard phone settings to using the services of mobile operators.
Before moving on to specific actions, it is worth understanding the nature of these calls. The hidden number is transmitted thanks to a special tag in the signaling system of the telephone network. Android-smartphones are able to recognize this flag and automatically reject the call if you have configured the appropriate filter in advance. This is not just convenient, it is a matter of your digital hygiene and safety.
Standard blocking tools in Android settings
The easiest and most reliable way to stop anonymous callers is to use the functionality of the “dialer” itself. The interface may differ depending on the manufacturer of your device, but the operating logic remains the same for the entire ecosystem. You will need to go to the calling application, which usually has a handset icon.
Find the menu button in the application interface. It may look like three vertical dots in the corner of the screen or a settings gear. After clicking, select item Settings. In the list that opens, look for the section related to blocking. It may be called Number blocking, Call barring or Call filtering.
Inside this section you you will find a switch with a name like "Block unknown numbers" or "Reject hidden numbers". Activating this feature will cause your smartphone to automatically drop any call where the caller ID is not transmitted to the network. This works at the system level, so the call does not even have time to ring.
⚠️ Attention: Enabling this function may cause you to miss an important call from a doctor, courier or emergency service employee who, for technical reasons, is calling from hidden number. Use this method with caution.
It is worth noting that on some custom skins, such as MIUI from Xiaomi or One UI from Samsung, the path to this setting may be slightly different. Sometimes the option is hidden deep in the general settings of the phone, and not in the calling application itself. If you do not find the switch right away, use the search in the device settings by entering the request “blocking”.
Before turning on total blocking of anonymous calls, warn close relatives so that they disable hiding the number on their devices, if such a function is active.
Using USSD codes of mobile operators
If If the built-in settings of your smartphone do not work or are unavailable for some reason, you can use the services of your mobile operator. Blocking at the network level is often even more effective because the call is filtered before it even reaches your device. For this, special USSD commands are used.
Each major operator in Russia and the CIS countries has its own codes for managing the Anti-AON (Automatic Number Identification) service. These commands are entered directly into the dialing field, as with a regular call. After entering the command and pressing the call button, you will receive a notification about activation or deactivation of the service.
Let's consider the basic commands for popular operators. Remember that the terms of service may change, so always check the relevance of the codes in your personal account or on the official website of the communication provider.
| Operator | Activation command | Deactivation command | Service status |
|---|---|---|---|
| MegaFon | *105# (menu) |
*105# (menu) |
Paid/Free* |
| MTS | *111*442# |
*111*443# |
Paid |
| Beeline | *110*771# |
*110*770# |
Paid |
| Tele2 | *129*1# |
*129*0# |
Free |
Please note that some operators may have a paid service for this. For example, MTS and Beeline often charge a monthly subscription fee for the “Black List” or “Anti-AON” function. For Tele2 and MegaFon, basic blocking may be included in the standard service package. Attention: the tariff policy is changing, so before activation, carefully read the pop-up message about the cost.
Blocking through third-party applications
When standard tools are not enough, specialized applications from the store come to the rescue Google Play. These apps have expanded spammer databases and more flexible filtering settings. They not only block hidden numbers, but can also identify organizations from which annoying calls are received.
One of the most popular solutions is the application Kaspersky Who Calls or Truecaller. After installation and provision of the necessary permissions (access to calls and contacts), the application begins to analyze incoming traffic. You can configure the filter so that it rejects calls from all numbers that are not in your phone book.
The setup process in such applications is usually intuitive:
- 📲 Download the application from the official store and run it.
- 🛡️ Grant rights to manage calls in the system window permissions.
- ⚙️ Go to the “Blocking” or “Filter” section in the application menu.
- 🚫 Activate the toggle switch “Block hidden numbers” and “Block unknown”.
An important advantage of third-party software is the presence of “white lists”. You can add the numbers of important services or relatives there, and even if they call from a hidden number (which is unlikely if their devices are configured correctly), the call will go through. However, remember that such applications require access to your personal data.
⚠️ Attention: By giving an application access to your contacts and call history, you are trusting it with confidential information. Choose only proven solutions from well-known developers, such as Kaspersky Lab or Yandex.
Some users are afraid that third-party dialers will consume a lot of battery power. Modern optimized versions work in the background and consume minimal resources, activating only when there is an incoming call. However, if you notice increased power consumption, check the power saving settings for a specific application.
Lock features on different versions of Android
The Android interface evolves with each version, and the location of key settings may change. What worked on Android 10may look different on Android 14. Google strives to unify the user experience, but smartphone manufacturers often make their own adjustments to the menu design.
On “pure” Android (Pixel, Motorola, Nokia smartphones), the path to blocking usually lies through the Phone application → Three dots → Settings → Blocked numbers. There is a separate switch here "Unknown numbers". Activating it blocks calls from subscribers who are not in your contacts, as well as hidden numbers.
In shells from Samsung (One UI), the logic is slightly different. You need to go to Phone → Three dots → Settings → Block numbers. Here you will see two independent switches: one for blocking unknown numbers (not from contacts), the second - specifically for "Hidden numbers". This gives more fine-grained control: you can allow calls from new people, but prohibit anonymous ones.
Why can settings be reset?
Sometimes after a major system update or a factory reset, the blocking settings may return to their default state. It is recommended to check the call filtering settings after each global firmware update.
On Xiaomi devices with MIUI or HyperOS shell, the function may be called “Antispam”. It's built into the Security app. Go to the Security application → Antispam → Settings (gear) → Blacklist. Here you can enable blocking of hidden numbers, as well as configure blocking by keywords in SMS or number type.
Radical methods: Do Not Disturb mode
If none of the above methods help or you need absolute silence for a short period, you can use the Do Not Disturb (Do Not) mode Disturb). This tool is built into any version of Android and allows you to tightly control who can reach you.
When this mode is activated, the phone does not ring or vibrate for incoming calls. However, you can configure exceptions. Go to Settings → Sound and vibration → Do not disturb → People → Calls and messages. Select the option Contacts only or Favorite contacts.
In this mode, all calls from numbers not saved in your phone book will be automatically rejected or simply will not make a sound. Hidden numbers, not being saved in contacts, will also fall under this filtering. This is ideal for nights or important meetings.
- 🌙 Enable the mode through the notification shade or sidebar.
- 📞 Make sure that only the necessary categories of subscribers are selected in exceptions.
- 🔕 Check that the “Repeat calls” option is disabled if you want block even those who call twice in a row.
The disadvantage of this method is that it blocks all unknown people, not just hidden numbers. If you are waiting for an important call from a courier or taxi who calls from landline or corporate numbers, you may miss it. Use this method situationally.
Do Not Disturb mode is a temporary measure to ensure silence, and not a permanent spam filter. For constant protection, it is better to use specialized blocking settings.
Frequent problems and their solutions
Sometimes users are faced with a situation where, it would seem, all the settings have been made correctly, but hidden calls still go through. This may be due to the operating characteristics of a particular dialer application or a software conflict. For example, if you have multiple calling apps installed, the system may use a different one than the one you set to block.
Try clearing the Phone app cache. To do this, go to Settings → Applications → Phone → Storage → Clear cache. This won't delete your contacts or call history, but it may fix errors in filtering. Also make sure that the application has all the necessary permissions.
⚠️ Warning: If you are using a corporate SIM card or an employer-issued phone, blocking functionality may be limited by the device administrator. In this case, contact your company's IT department.
Another reason for failure is an outdated firmware version. Manufacturers regularly release security updates that may affect the operation of the telephone module. Check for updates in the menu Settings → System → System update. Installing the latest version of software often solves software glitches.
FAQ: Frequently asked questions
Will I see missed calls from hidden numbers?
Yes, in most cases the call will appear in the call log as "Missed" or "Rejected" but without a number. In some applications (for example, Truecaller), such calls may fall into a separate “Spam” or “Blocked” tab, so as not to clutter the main list.
Is it possible to block a hidden number only for a certain time?
It is impossible to set a blocking timer using standard Android tools. However, you can use Do Not Disturb mode with a schedule. Configure it to turn on, for example, from 22:00 to 08:00, and at this time all unknown and hidden numbers will be blocked automatically.
Does blocking hidden numbers affect the reception of SMS?
No, setting the blocking of incoming calls from anonymous callers does not affect the delivery of text messages. You will continue to receive SMS even from those senders whose numbers are hidden or not saved in contacts, unless a separate filter is configured for messages.
What to do if an important subscriber calls from a hidden number?
Ask this person to disable the number hiding function in the settings of their phone or contact your telecom operator to temporarily disable the Anti-AON service on their side. Alternatively, add its number to the Whitelist of your blocking app if it supports this feature for hidden IDs.
Does blocking work on dual-SIM phones?
Yes, blocking settings usually apply to all active SIM cards in the device. However, in some shells (for example, older versions of MIUI), the settings may be tied to a specific SIM card. Carefully check for which communication line you activate the filter in the call settings menu.