Nobody likes it when, in the middle of a working day or during vacation, they receive a call from an unknown number offering a “favorable loan” or a “unique offer.” Spam calls have become a real epidemic for mobile device users, taking up time and nerves. Fortunately, the operating system Android provides a wide range of tools to combat this scourge, from built-in functions to specialized software.
You can install reliable protection against intrusive offers yourself, without having the skills of a programmer. In this article, we will analyze in detail all the available methods for blocking unwanted calls, compare the effectiveness of third-party applications, and tell you how to set up filtering at the telecom operator level. You will learn which settings security you need to check first so that your smartphone stops being a target for robocalls.
Built-in blocking functions in Android
Modern versions of the operating system from Google already contain basic security mechanisms. Owners of smartphones with “clean” Android or skins from Google Pixel can activate the “Spam Call Filter” function directly in the phone book settings. This option automatically identifies known numbers from scammers and advertising agencies by checking a global database, and either drops the call or marks it as spam.
To activate, you need to go to the “Phone” application, click on the three dots in the corner of the screen and select Settings → Caller ID and spam. Here you need to switch the slider to the active position. The system will work in the background without requiring constant user intervention. However, it is worth remembering that the effectiveness of this method depends on the relevance of the database in your region.
Smartphone manufacturers with their own shells, such as MIUI from Xiaomi or OneUI from Samsung, often implement their own filtering algorithms. In such devices, the path to the settings may differ: it is usually located in the Settings → Blocking numberssection. Here you can create strict rules, for example, blocking all calls from hidden numbers or anyone who is not recorded in your phone book.
Periodically check the “Blocked calls” folder in the built-in phone application to make sure that important calls from couriers or doctors who use work do not end up there numbers.
⚠️ Attention: Enabling the “Only from contacts” mode may cause you to miss an important call from a delivery service or bank if their number is not saved in your address book in advance.
Using the built-in tools is the first and easiest step. It does not require installation of unnecessary software and does not consume additional battery power. However, for maximum protection, it is often necessary to combine system settings with other methods.
Third-party antispam applications
If the built-in functions are not enough, specialized applications from the store come to the rescue. Google Play. The leaders in this niche are Truecaller, Kaspersky Who Calls i Yandex.Phone. These apps use huge user databases: if a thousand people mark a number as “Fraud”, the next owner of this number will receive a warning or automatic blocking.
Installing such an application requires certain permissions, in particular access to contacts and call logs. This is necessary for correct operation of number identification. After installation, the application takes on the function of a call manager. The user can configure levels of protection: from soft blocking only known spammers to a hard mode that filters out all unknown subscribers.
- 📱 Truecaller - the most popular solution in the world with a huge database of numbers, but requires careful attention to data confidentiality.
- 🛡️ Kaspersky Who Calls - a reliable option from a well-known security vendor with an emphasis on protection from scammers and paid subscriptions.
- 🇷🇺 Yandex.Phone —works great in the CIS countries, since the database is formed taking into account local characteristics and frequent changes of numbers by spammers.
It is important to understand that each application has its own interface features and resource consumption. Some may display ads in the free version or offer a premium subscription for advanced features such as listening to voicemail or identifying organizations. Before installing, carefully study the application rating and the latest user reviews.
Manually setting up a black list
Sometimes automatic filters miss annoying subscribers who often change numbers. In such cases, the most effective solution is to manually add contacts to the blacklist. This method ensures that a specific number will never bother you again with a call or SMS message. The process of adding to the blacklist is intuitive. Open your call log, find the unwanted number and tap on it. In the menu that appears, select “Block” or the crossed out circle icon. In some shells, for example in SMS message.
The blacklisting process is intuitive. Open your call log, find the unwanted number and tap on it. In the menu that appears, select “Block” or the crossed out circle icon. In some shells, for example MIUI, there is a separate section "Black List", where you can add numbers in bulk or by mask (for example, block all numbers starting with +7999).
Settings → Blocking → Blacklist → Add numberThere is also the ability to block not only specific numbers, but also entire ranges or types of numbers. For example, you can set up a rule to prevent calls from numbers with less than 10 digits, or to block all international calls if you don't expect calls from abroad. This is especially useful for protecting against robocalls using spoofed numbers.
☑️ Checking the blacklist settings
⚠️ Attention: Attackers often use the “spoofing” technique, replacing their number with a number similar to your own or the number of a well-known service. Blocking one specific number in this case may not be effective.
Protection services from telecom operators
Mobile operators (the "Big Four" in the Russian Federation and analogues in other countries) offer their own anti-spam services. These solutions work at the network level, meaning the unwanted call is cut off before it even reaches your smartphone. This means that the phone won’t even ring, and you won’t spend a second reacting.
Services can be either paid or free. For example, “Antispam” from MTS, “Spam Protection” from MegaFon or similar offers from Beeline and Tele2. Connection usually occurs through your personal account, USSD command or a special operator application. The number database is updated centrally by the operator and is considered one of the most relevant for this region.
| Operator | Name of service | Cost | Features |
|---|---|---|---|
| MTS | Antispam | Paid / Free (basic) | Advertising and fraud blocking, SMS notification |
| MegaFon | Spam protection | Paid | Flexible settings, white list, statistics in the application |
| Beeline | Antispam | Paid | Identification of organization numbers, blocking by categories |
| Tele2 | Black list | Paid | Manual addition, blocking hidden numbers |
The advantage of operator solutions is their independence from your phone model and Android version. The protection will work even on a push-button phone or if your smartphone is dead, but the SIM card is active in another device. However, for advanced features such as detailing blocked calls or setting up spam categories, you often have to pay a monthly subscription fee.
Operator services are the only way to block spam at the network level, which saves your smartphone's battery power, since the device does not waste resources at all on receiving an unwanted call.
Hide number and privacy
One of the radical but effective ways to avoid spam calls is to make your number unavailable for automatic collection by databases. Many spammers use parser apps that scan open sources on the Internet. If your number is not highlighted anywhere, the likelihood of being included in the call list is sharply reduced.
In the smartphone settings, you can activate the function of hiding the number for outgoing calls. To do this, go to Phone application settings → Additional settings → Number identification and select “Hide number”. Please note that when you enable this option, your calls will be displayed to subscribers as “Unknown number” or “Private number”, which may cause mistrust among interlocutors.
A softer option is to use virtual numbers for registration on websites, online stores and delivery services. There are applications that provide temporary numbers for receiving SMS or calls. The main number remains secret and is used only to communicate with family and colleagues. This creates a reliable barrier between your personal life and the marketing activities of companies.
⚠️ Attention: Some banking services and government portals may refuse registration or verification if they see that the call is coming from a hidden number or virtual IP phone. Use primary numbers for critical services.
It is also worth regularly checking whether your number is included in open data leak databases. There are special services that allow you to check the presence of your phone in merged databases. If a number is detected there, you should be prepared for a surge in spam and strengthen your filtering settings.
Legal aspects and complaints about spam
The fight against spam is carried out not only by technical, but also by legal methods. Most countries have laws prohibiting intrusive advertising and calls without the subscriber's consent. If you regularly receive calls from the same organization, despite requests to stop, you have the right to file a complaint.
In Russia, administrative liability is provided for violating telephone advertising rules. The complaint can be sent to the Federal Antimonopoly Service (FAS) or Roskomnadzor. To do this, you need to record the fact of the call: save the number, time of the call and, preferably, a recording of the conversation. Collective complaints from different subscribers to the same number are considered priority and often lead to large fines for violators.
In addition, almost every major operator has a channel for receiving complaints about spam. By sending an SMS with the text of a complaint to the operator’s short number or via a chatbot, you help update databases and block violators for all network clients. This is a civil position that makes the air cleaner for everyone.
How to properly record a conversation for a complaint?
In order for the recording of a conversation to have legal force, at the beginning of the conversation it is necessary to warn the interlocutor that the conversation is being recorded. The phrase “I am recording our conversation for quality control” is usually sufficient. If the interlocutor does not object, the recording can be used as evidence.
Frequently asked questions (FAQ)
Is blocking a number paid?
Built-in Android functions and manual blocking in the blacklist are absolutely free. Third-party apps often have a free version with limited functionality and a paid subscription. Telecom operator services are typically charged on a monthly basis, although basic versions may be free.
Will the spammer see that I have blocked him?
No, the sender of the call will not receive notification of the block. For him, the call will simply go on for a long time and then be dropped, or go straight to voicemail, depending on the settings of your operator and phone.
Is it possible to block all unknown numbers?
Yes, in the settings of most smartphones and antispam applications there is a function “Block everyone who is not in contacts.” Activate it if you are ready to miss calls from couriers, taxis and new acquaintances who are not yet recorded in your book.
Do anti-spam applications slow down your phone?
Modern applications are optimized and work in the background, using a minimum amount of resources. However, on very old smartphone models with low RAM (RAM), installing several heavy security applications may have a slight impact on system performance.