How to block spam SMS on Xiaomi phone: the complete guide

Modern smartphone users face intrusive advertising and fraudulent mailings every day. Xiaomi, with one of the most popular shells MIUI and HyperOS, offers built-in tools to combat unwanted content. However, many device owners are unaware of the hidden filtering features or do not know how to configure them correctly. Ignoring this problem can lead not only to annoyance, but also to the loss of personal data through phishing links.

In this article, we will take a look at all the available ways to insulate from digital noise. You will learn to use standard system functionality, configure smart filters and connect specialized software if necessary. The built-in MIUI blocker works at the system level and does not require the installation of additional applications, which saves battery life. Understanding these mechanisms will allow you to create a reliable barrier for fraudsters and advertisers.

Use of the built-in "Security" application

The first and most effective tool in the user’s arsenal is the system application Security. It is preinstalled on all devices of the brand and contains the module “Antispam”, which works with incoming messages and calls. To access the settings, you need to launch the application and select the appropriate section at the bottom of the screen or in the tool menu.

The interface of the module may vary slightly depending on the version of the shell, but the logic remains the same. Here you can activate a common lock switch that will instantly start filtering incoming traffic. The system automatically analyzes the text of messages and sender numbers, comparing them with a vast database.

• 📱 Open the Security app on the desktop.
• 🛡️ Select the Antispam menu item (shield icon).
• ⚙️ Click on the settings gear in the upper right corner.
• ✅ Activate the slider "Block" SMS by-the-unknown».

It is important to note that activating filtering does not mean total loss of information; all blocked messages are stored in a special log, where you can look at any time, which allows you to monitor the operation of the system and, if necessary, restore important notifications that may have been mistakenly classified as spam.

Setting up a blacklist and smart filters

To fine-tune the protection against specific senders, the Blacklist feature allows you to manually enter phone numbers that you want to ignore completely, especially for intrusive delivery services or companies that continue to send ads even after you have abandoned the service.

The anti-spam settings menu also includes Smart Filters, which uses machine learning algorithms to detect typical signs of fraudulent messages, and it pays attention to keywords such as “credit,” “winning,” “card locked,” and other trigger phrases specific to social engineering.

⚠️ Note: When you turn on aggressive keyword filters, you risk missing legitimate notifications from banks or services that use similar vocabulary in their newsletters.

You can edit your keyword lists yourself by adding or removing terms, which gives you complete control over what the system will consider suspicious, for example, if you don't use microloans, you can add the corresponding organization names to the stop list.

Regular updates to the spam database are in the background if the Internet is connected. It is recommended to periodically go to the settings and check for updates to local databases to ensure that protection remains relevant against new fraud schemes.

Blocking messages from unknown numbers

Special attention should be paid to blocking messages from numbers that are not in your phone book. In an environment where personal data is often leaked to the network, this mode becomes critical, and allows a whitelist method to allow messages only from contacts with whom you communicate.

Activation of this option is in the depth of the message settings. The path can look like Settings → Messages → Spam filter → Block from unknowns. Once enabled, all SMS from numbers not saved in contacts will automatically move to the spam folder without audible notification.

However, be careful: in today’s world, many services (couriers, taxis, support services) call and write from short or dynamic numbers that are not in your notebook.

The best strategy is to combine methods: use a smart filter for general protection and blacklist only those who are really bothering, and it is better to switch on the full lock mode of unknown numbers temporarily if you are attacked with spam.

Working with the Spam folder and recovering messages

All filtered messages are not permanently deleted, but are moved to an isolated Spam folder, which can be found in the Messages app, usually displayed as a separate tab or in the chat settings menu, and which stores the history of all blocked communication attempts.

Check the contents of this folder periodically, to make sure that the filters are working correctly, and if you see that important notifications from banks or government agencies are being spammed, you should add the sender to the whitelist or exclude it from the filter.

To recover a message, just open it, click three dots in the corner of the screen and select the option “This is not spam” or “Restore”. After that, the message will return to the main inbox, and the sender number will be marked as safe for future communications.

The system automatically cleans the spam folder after a certain period of time (usually 30 days) so that it does not take up space in the device’s memory.

Third-party applications to combat spam

If MIUI is not built in, users can turn to third-party solutions, the most popular and effective tool being the Truecaller or Yandex.Spam application, which have huge user-generated number databases.

Installing such software requires advanced permissions to access calls and messages, which is necessary so that the application can intercept an incoming call or SMS before they appear on the screen, and check the number with the cloud base.

• 📥 Download the app from the official Google Play store.
• 🔐 Provide the necessary access rights at the first launch.
• 🗑️ Enable the lock function in the application settings.
• 🔄 Regularly update the spam number database.

Using third-party solutions has its advantages, such as more accurate identification of advertising numbers and integration with the number determinant. However, it is worth considering that these applications can consume more battery resources and transmit data about your contacts to their servers for analysis.

⚠️ Warning: Be careful when installing little-known anti-spam apps, some of which may be the source of advertising or may collect sensitive data without the user’s knowledge.

For most users, a bundle of built-in Xiaomi filter and one verified number database (e.g. from Yandex or Google) is more than enough for a comfortable smartphone use.

Prevention and Digital Hygiene

Technical settings are only half the solution, and the other half is your digital behavior, and the main source of spam is posting your phone number on questionable websites, forums, or participating in campaigns that require excessive personal data.

Never follow links in messages from unknown senders, even if they look like notifications from a bank or postal service. Fraudsters often use social engineering techniques, masquerading as official organizations. If in doubt, it is better to call back to the organization by yourself on an official number.

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Use the second number to register. SIM-A card or virtual number to participate in promotions, register on websites and purchase online stores.

It's also recommended that you check periodically which sites have your number registered on, and there are services that allow you to see data leaks, and if your number is lit up in the database of leaks, the amount of spam can increase dramatically, and then only a change of number or very rigid filtering will help.

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A comprehensive approach, including system settings, blacklisting and online caution, provides maximum protection against unwanted messages.

Compliance with these simple rules, combined with a properly configured Xiaomi smartphone, will allow you to forget about the annoying squeak of notifications and focus on the really important things. Digital security begins with being attentive to your device's settings.