Spam mailings and intrusive notifications from unknown numbers have become a real problem for smartphone owners. SMS blocking on Xiaomi is not just a way to keep calm, but also a necessary measure of digital hygiene to protect against phishing and fraud. The built-in MIUI shell tools (HyperOS) allow you to effectively filter incoming messages without installing third-party software.
Users often face situations where standard call blocking methods seem intuitive, but text messaging management requires more fine-tuning. Xiaomi's system offers a powerful security module that may not be activated by default or configured strictly enough. Understanding the principles of anti-spam filters will allow you to completely isolate the device from information noise.
In this guide, we will take a look at all the methods available, from simply adding a contact to a blacklist to creating complex keyword filtering rules, and learn how to automatically block hidden numbers and messages that contain certain phrases that are specific to advertisers.
Use of the built-in Security application
The main protection tool in Xiaomi smartphones is the system application Security. This is where all the necessary functions for managing incoming traffic are concentrated. To get started, open the application and find the Antispam or Lock section. The interface may vary slightly depending on the firmware version, but the logic remains the same.
Inside the lock menu, you can have a list of blocked numbers and a log of attempts to communicate, and you can manually add the contact to the blacklist by clicking on the appropriate button (usually a plus or plus user icon), after adding the number, all SMS and calls from it will silently be rejected without disturbing the owner.
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If you have blocked the number by mistake, it will remain in the “Blocked” list in the Security app, from where it can be quickly deleted.
It is important to note that the system automatically updates the databases of fraudulent numbers if the appropriate option is enabled in the settings, which allows you to filter spam at the server and database level, without missing known threats to the device.
☑️ Setup of basic protection
Set up filtering by keywords
One of the most effective features for combating mass mailings is keyword filtering, which allows you to block messages containing certain phrases, even if the sender number changes every time (which often happens when using a certain type of mailing). GSM-To activate this function, go to the anti-spam settings and select Keyword Filter.
In the window that opens, you need to enter the words that are most often found in advertising messages, such as the names of bookmakers, the words "promotion", "credit", "winning" or specific abbreviations, the system will scan the text of incoming SMS, and if it matches the keyword, the message will automatically move to the spam list.
⚠️ Warning: Be careful when adding common words to the lock list.If you add an overly common word, you may miss an important notification from the bank or delivery service where the word is used in the context of the lock list.
For maximum efficiency, it is recommended to make a list of the 10-15 most common spam tokens, and you can edit this list at any time, adding new keywords as new types of scams appear, making the method flexible and adaptable to the current situation.
Blocking of hidden and unknown numbers
A separate category of problems is messages from hidden numbers or unknown identifiers. In the Security settings, there is an option to block all messages from subscribers whose numbers are not stored in your phone book.
Unknown blocking mode is activated via the anti-spam settings menu. Find the "Block Messages from Unknown" or similar switch. Once turned on, the phone will ignore any SMS if the sender number is not in the contacts.
This method is ideal for those who do not expect important messages from couriers or support services using short numbers or virtual identifiers, but it is worth remembering that some services (such as banks) can use short numbers that the system can classify as unknown if they are not entered in the database.
| Type of filtration | Efficiency | Risk of missing important SMS | Difficulty setting up |
|---|---|---|---|
| Blacklist of numbers | High (for specific individuals) | Low. | Low. |
| Keywords | Medium/High | Medium. | Medium |
| Blocking of unknowns | Maximum | High-pitched | Low. |
| MIUI Smart Filter | Tall. | Low. | Low. |
Working with the Messages app from Google
Many modern Xiaomi models have Google Messages installed by default, which has its own non-systemic security mechanism. To set up lock here, open the app, click on the three dots in the upper right corner and select Settings.
From the settings menu, go to Protect Against Spam, where you can turn on the "Filter Spam Messages" feature. Google uses its powerful machine learning algorithms to identify suspicious messages. If the system recognizes text as spam, the message will be moved to a separate "Spam and blocked" folder.
The difference between the system filter and Google Messages
You can self-tag messages as spam, and you can train the algorithm, so if you get a suspicious text, open it, click three dots, and select Report Spam, which will help protect not only you, but other users around the world.
Third-party applications for enhanced protection
When built-in tools are not enough, it makes sense to turn to specialized applications from Google Play, which are the leaders in this field are Truecaller, Should I Answer? and Yandex (with the function of the detector and blocker), these applications have huge databases generated by users themselves.
Installing such an application requires granting advanced access rights to SMS and call log. Once set up, the program will automatically analyze each incoming message. If the number is listed in the database as spam, the application will block it or put it in quiet mode.
⚠️ Note: Installing third-party blockers may conflict with Xiaomi’s system filter.It is recommended to use either built-in tools or one third-party app, disabling duplicate features elsewhere to avoid double notifications or message loss.
The advantage of third-party solutions is that you can fine-tune rules, such as blocking messages that link to specific domains or messages sent at night from unknown numbers, giving the user full control over the incoming data stream.
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Third-party apps work best with manual moderation: periodically check the Spam folder to make sure that important notifications do not get there.
Analysis of blocked messages and recovery
Periodically, you need to check the folder of blocked messages, sometimes important notifications that have been mistakenly classified by the filter as spam get there. In the Security or Messages app, look for the "Blocked" or "Spam" section.
If you find an important message, you can restore it by selecting the appropriate option in the message menu, and you can add the sender number to the whitelist (exclusion list) so that in the future, their messages always reach the main inbox, ignoring any filtering rules.
Cleaning your keyword list regularly and updating your number database will help keep your security system up to date. Remember that scammers are constantly changing tactics, and your defenses must evolve with them.