Constant notifications about incoming messages from unwanted senders can irritate even the calmest user. Whether it's intrusive advertising of services, notifications from banks about other people's transactions, or simply spam from scammers, such messages are not only annoying, but also create a feeling of violation of personal space. Fortunately, the operating system Android provides quite flexible tools to solve this problem, allowing you to completely isolate yourself from a specific number.
The blocking process may vary depending on the firmware version and device manufacturer. Smartphone owners Samsung, Xiaomi or Pixel may encounter slightly different menu interfaces, but the basic principle remains the same: the system must intercept the incoming signal and not display it to the user. In this article, we will analyze in detail all the available methods, from built-in functions to using third-party applications.
Before taking drastic measures, it is worth understanding that simply deleting the message will not solve the problem. The subscriber will continue to send you notifications, taking up memory space and distracting attention. Full blocking is the only way to guarantee silence. We will consider both standard tools and opportunities provided by telecom operators so that you can choose the most convenient option for yourself.
Using the built-in functions of the Android system
Modern versions Android (starting from 9.0 and higher) have a built-in mechanism for filtering spam and blocking contacts. This is the most reliable method, since it works at the system level and does not require the installation of additional software. The functionality may be hidden in the settings of the Messages application, which is standard for most devices.
To activate the blocking, you need to open the messaging application and find the desired number in the list of conversations or in the call history. Typically, long pressing on a message or contact is enough to bring up the context menu. In this menu you should look for the item Block or Add to blacklist. After confirming the action, all future messages from this number will be automatically rejected.
However, in some shells, such as MIUI from Xiaomi or OneUI from Samsung, the settings can be moved to a separate system partition. There you can not only block a specific number, but also set up filters for all messages from unknown senders. This is especially useful if spam comes from different SIM cards.
- 📱 Open the Messages application and click on the three dots in the corner of the screen.
- 🚫 Select "Settings" and go to the "Spam Protection" section.
- 🔒 Activate the "Block spam" switch or add the number manually to the blacklist.
- 🗑️ Delete existing correspondence with an unwanted caller to clear the history.
If the standard application does not allow you to block a number, try installing the Google Messages application from the Play Market - it has some of the best filtering algorithms on the market.
It is important to note that once blocked, the sender will not receive a notification that their message was not delivered. To him, the process looks like the message was sent successfully, although it will never appear on your device. This helps avoid escalation of the conflict if a familiar person is blocked.
Blocking through the phone book and call log
An alternative and often faster way to block an unwanted caller is to do it directly through the call log or contacts. This method is universal and works on almost all devices running Android. The logic here is simple: if a number is blacklisted in the phone book, the system automatically applies blocking rules to all types of communication, including SMS messages calls.
Go to the “Phone” application and open the tab with call history. Find the number the messages are coming from and click on it to reveal detailed information. The window that opens often has a “Block” button or a crossed out circle icon. By clicking on it, you will confirm adding the number to the list of ignored contacts.
☑️ Checking contact blocking
Some manufacturers implement this function in different ways. For example, on devices Huawei or Honor you need to go to the settings of the “Phone” application itself, find the “Blocked” section and add the number there manually, copying it from the log. This takes a little more time, but gives more detailed control over the list.
⚠️ Attention: Blocking through the phone book may not work if spam comes from short service numbers that cannot be saved as a regular contact. In such cases, use keyword filters.
It is also worth considering that if the subscriber has changed the SIM card or is calling from another number, the old blocking will not work. Therefore, for mass mailing of spam, this method is less effective than using specialized applications with databases of fraudulent numbers.
Third-party applications for filtering spam
If the built-in tools of the system seem insufficiently effective to you or the interface is too confusing, third-party solutions come to the rescue. App stores offer dozens of utilities specializing in anti-spam protection. The leaders in this niche are applications like Truecaller, Should I Answer? or Kaspersky Who Calls.
The main advantage of such apps is the presence of huge cloud databases. When you receive a message from an unknown number, the application checks it against the database and, if the number is marked by other users as “Spam” or “Scammers”, it automatically blocks it or warns you. This allows you to deal with mass mailings that change the sending numbers.
| Application | Blocking type | Availability of database | Paid version |
|---|---|---|---|
| Truecaller | Automatic | Global | Yes |
| Should I Answer? | Manual/Auto | Community | No (Donation) |
| Yandex with Alice | Determinant | RF/CIS | Plus subscription |
| Kaspersky | Antivirus+ | Labs | Yes |
When installing such applications, you will need to grant them permissions to access calls and messages. This is necessary for the filter to work correctly. Without these rights, the app will not be able to intercept incoming data. Be careful when granting rights and download software only from the official store Google Play.
It is worth remembering that some free versions of applications may show advertising or require access to your phone book to replenish their own database. If the issue of privacy is acute for you, carefully study the developer's privacy policy before installation.
Blocking services from mobile operators
Mobile operators (the "Big Four" in the Russian Federation and other providers in the CIS) also offer their solutions to combat unwanted messages. These services work on the network side, meaning the message is blocked before it even reaches your smartphone. This saves battery power and traffic, since the device does not need to process the incoming data packet.
Each operator has its own service, often called “Antispam”. For example, MTS is the “Antispam” service, Beeline is the “Spam Protection” service, and MegaFon i Tele2 there are similar options. The connection is usually made through the operator’s personal application, a USSD command or a call to support.
The advantage of operator solutions is that they can block not only specific numbers, but also entire categories messages, for example, from short number services or advertising mailings. Some services use artificial intelligence to analyze the contents of messages before delivering them.
⚠️ Attention: Operators' terms and conditions for providing antispam services may change. Some functions may become paid or the pricing may change. Be sure to check the current information in your personal account or the official application of your operator.
To activate, it is often enough to send a free SMS code word to the service number or enter a command in the dialer. For example, the command might look like *111*442# (example for illustration, code depends on the operator). After connecting to your personal account, you usually have the opportunity to manage the “white” and “black” lists.
Filtering by keywords and templates
One of the most effective, but rarely used methods is blocking by keywords. This method is ideal in situations where spam comes from different numbers but contains the same text. For example, if you are bombarded with messages with the words “Credit”, “Win” or the names of specific bookmakers.
In the settings of most advanced messaging applications (including Google Messages and third-party clients) there is a “Filters” or “Banned words” section. By adding an unwanted phrase there, you automatically send all messages containing this text to spam, regardless of the sender number.
How do smart filters work?
Smart filters analyze not only the exact match of words, but also the context. However, in order not to miss an important message from the bank where the word “loan” may appear, it is better to use combinations of words or the exact names of organizations.
Using this method requires caution. If you block a word that is too common, you may miss an important notification. For example, blocking the word "code" can hide the two-factor authentication verification code from you. It is recommended to start with unique brand names or specific phrases from advertising mailings.
To configure, go to Settings → Spam and protection → Blocked words. Enter a list of terms there that are guaranteed to indicate inappropriate content. The system will apply this filter to all new incoming messages in real time.
What to do if messages keep coming
Sometimes it happens that despite all the measures taken, messages from the subscriber continue to arrive. This may be due to the fact that the sender uses special gateways to bypass blocking, replaces the sender's number (spoofing), or uses service numbers that are technically difficult to block using standard means.
In such cases, it is recommended to perform a full scan of the device. Make sure there is no malware on your phone that could imitate incoming messages. Download an antivirus and scan your system. Also check whether message forwarding to another number is activated, although this rarely affects the display of notifications on the current device.
If the problem is widespread and concerns operator numbers, the most effective method remains a complaint directly to the communication provider. Operators have the technical ability to block distribution channels at the network level if they violate the rules of traffic transmission.
An integrated approach (built-in filter + application + operator service) provides a 99% guarantee of protection against any type of SMS spam.
As a last resort, if a specific number is not blocked by any means, you can contact law enforcement agencies if the messages are threatening character. The telecom operator, at the request of the authorities, can provide information about the owner of the SIM card from which the mailing is carried out.
Frequently asked questions (FAQ)
Will the sender know that I have blocked his number?
No, standard SMS protocols do not provide for sending a notification to the sender about blocking. The message will appear as “Delivered” to him, although in fact it was rejected by your phone or the operator’s server.
Where are blocked messages stored?
In most cases, they are not stored at all and are deleted immediately after receiving. However, in some applications (for example MIUI or when using Truecaller) there is a separate "Spam" or "Blocked" folder where they are placed in case you want to check them.
Is it possible to block messages from short codes (5 digits)?
Yes, this can be done through the settings of the Messages application, adding the number to the blacklist, or through the services of a telecom operator, which often have special filters specifically for service short numbers.
Does blocking SMS affect the ability to make calls from this number?
Usually yes. When you add a number to the black list in the phone book, both calls and messages are blocked. However, in some messaging applications you can set up blocking only for SMS, leaving the possibility of dialing.
How to unblock a number if I did it by accident?
Go to the settings of the Messages or Phone application, find the Black List or Blocked Contacts section, select the desired number and click Unblock or the trash can/cross icon next to them.