How to block SMS messages on Xiaomi: the full guide

Xiaomi’s current smartphones, powered by MIUI or the new HyperOS, are powerful tools for work and entertainment, but they often face intrusive advertising and fraudulent mailings. The constant stream of useless notifications is not only annoying, but can also pose a real threat to the security of a user’s personal data and finances. Which is why the question of how to block SMS on Xiaomi is becoming one of the most pressing questions for millions of owners of these devices around the world.

There are many ways to address this, from built-in features that many ignore to installing specialized third-party software. Xiaomi's built-in protection algorithms are quite effective, but they require the right initial setup, which the manufacturer does not always include by default. Understanding the filtering mechanisms will allow you to create a reliable shield from unwanted information noise.

In this detailed guide, we’ll take a look at all the blocking techniques available, from simple blacklisting settings to advanced keyword filters. You’ll learn to distinguish real messages from spam, prevent phishing attempts, and regain your peace of mind when using a mobile device.

Use of built-in antivirus and spam filter

The first and most logical step to protect your Xiaomi is to activate the built-in security tools that developers have integrated directly into the core of the system. Unlike many other manufacturers, Xiaomi provides a powerful combine called "Security", which includes not only a virus scanner, but also an effective call and message filter. This module operates at a low level of the system, which allows it to intercept spam even before it appears in the main inbox.

To get started, you need to open the Security app, which has a green shield icon and is usually located in the Tools folder or on the home screen. Inside the menu, you should find the Antispam section, where all lock settings are concentrated, and here you will see switches to lock hidden numbers, international codes, and the ability to turn on a smart filter that analyzes the content of messages in real time.

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Be sure to regularly update spam databases in your anti-spam settings so that the system recognizes new types of fraudulent mailings.

It is important to note that the smart filter can sometimes fail and hide important notifications from delivery services or banks, so the initial period of use requires your attention.It is recommended that you set up notifications about blocked messages to be able to periodically check the Spam folder for false positives, which will ensure a balance between the purity of the Inbox and the omission of critical information.

• 🛡️ Activate the "Spam filter" switch SMS" in the menu of antispam settings for automatic advertising hiding.
• 📞 Enable hidden number locking to protect against anonymous scammers.
• 🔔 Set up an audible alert only for selected contacts, ignoring others.
• 📂 Regularly clean the log of blocked messages to free up the device memory.

Set up the blacklist manually

If automatic filters don’t deal with a specific source of irritation, the most reliable method is to manually add numbers to the blacklist. This approach is ideal for situations where you are pestered by a particular sender whose numbers may change but contain common signs, or when you need to block a newsletter from a short service number. MIUI This process is implemented as conveniently as possible and does not require root rights.

To add a number to the lock, open the standard Messages app, find unwanted correspondence and click on it. In the dialog that opens, tap the contact avatar or name at the top of the screen to go to. In the menu that appears, select Another (often indicated by three dots) and click Add to the blacklist. After that, all messages from this number will automatically move to the hidden folder.

⚠️ Attention: Blocking a number in messages does not always mean blocking incoming calls from the same number. To completely isolate the contact, you need to duplicate the action in the Phone application or through the system lock settings.

You can also block entire ranges of numbers or numbers that start with specific numbers, which is especially true in spam bot attacks. To do this, select the option to add by mask or prefix in the blacklist settings, which will cut off thousands of potential calls and SMS from telemarketers in one action, without entering each number individually.

Blocking by Keywords and Templates

One of the most powerful but often ignored tools in Xiaomi’s arsenal is keyword filtering, which allows you to block any messages containing certain phrases, regardless of the sender number.This is especially effective against the massive advertising of casinos, credits, gambling and other typical verbal constructs used by spammers.

To configure this mechanism, go to Security -> Antispam -> Settings (cogs). Find the Keyword Filter or Keywords to block. Here you can create your own list of terms such as "winning", "credit", "card blocked", "promotion", etc. The system will scan the text of incoming SMS and, if it finds a match, instantly hide the message.

The effectiveness of this method depends on your attention when compiling a list. Too general words can lead to the loss of important notifications, so use unique combinations or specific terms that are specific to the type of spam that you are concerned about. For example, blocking the word "casino" will not affect messages from the bank, but it will cut off gambling advertising perfectly.

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The combination of locking by number and keyword creates a double barrier that is almost impossible for any advertising message to pass through.

Third-party applications for enhanced protection

Xiaomi’s built-in tools are good, but sometimes they aren’t enough to fight sophisticated spam, especially when it comes to messaging or complex forms of advertising, and in such cases, specialized apps from the Google Play store that use global databases and artificial intelligence to identify threats come to the rescue.

One of the leaders in this niche is Truecaller, which has a huge database of numbers tagged by users around the world, not only blocks calls, but also effectively filters SMS messages by labeling them as "Spam", "Advertising" or "Fraud", and installing such an application gives access to cloud databases that are updated every second, making protection relevant against new schemes of deception.

Another great option is SMS Blocker or solutions from well-known antivirus companies like Kaspersky or Dr.Web. These applications often provide more flexible filter settings, the ability to create lock schedules and detailed statistics. However, it is worth remembering that installing a third-party application requires broad permissions to access your messages, which can raise questions for users who are worried about privacy.

• 📱 Truecaller – the best cloud-based numbering and efficient filtering SMS-spam.
• 🔒 SMS Blocker is a lightweight, open source application with flexible rules.
• 🛡️ Kaspersky Security – comprehensive protection with anti-spam and anti-phishing module.
• 🤖 AI Filter – Using neural networks to analyze the context of messages.

⚠️ Note: When installing third-party SMS blocking apps, carefully review the permissions you request. Make sure the app is not authorized to send messages on your behalf or access confirmation codes without your knowledge.

Blocking Messages from Service Numbers

A separate category of irritants are short service numbers, which are used to send mailings from mobile operators, delivery services and large retailers, the problem is that these numbers are often changed or are alpha names, which makes conventional locking on a number ineffective. To fight them in MIUI Android and in general, there are specific settings.

First of all, try unsubscribing in a legal way. Many operators and services allow you to send a code (such as the word "STOP" or the number "0") in response to an advertising message so that you no longer receive notifications. This method is the most secure and does not disrupt the operation of other services.

If unsubscribe doesn’t help or is ignored, use the function of blocking messages from unknown senders in the Xiaomi settings. Go to Settings -> Applications -> Messages (or the settings of the message application itself) and find the Unknown Filter. Activating this feature will hide all messages from numbers that are not in your phone book, moving them to a separate folder “Spam” or “Unknown senders”.

Frequently Asked Questions (FAQ)