Spam calls and intrusive messages from unknown subscribers have become a scourge of modern times. Xiaomi, Redmi and Poco smartphone owners often face the need to quickly restrict access to unwanted contacts. Fortunately, the shells of MIUI and the new HyperOS have a powerful filtering tool built in, without requiring the installation of third-party software.
The Blacklist (or Lock) function works at the system level, allowing you to block calls even before they reach your screen, not only saving nerves, but also saving battery power, preventing unnecessary display turn on. In this article, we will discuss in detail all ways to configure lock.
Consider both standard methods through the contact menu and advanced antivirus settings, which often go unnoticed by users, you will learn how to create exception lists, configure blocking by keywords and hide the fact of blocking from the caller.
The fastest way to blacklist a specific number on Xiaomi is to use the phonebook's built-in menu, which is ideal when you need to block one particular troublemaker urgently, and the algorithm is the same for most shell versions.
Open the Contacts or Phone app and find the number you want in your call history or contact list. Click on the subscriber's name to go to the contact card, then select the menu icon (usually three dots or a gear) and find the "Block" item. Once confirmed, the number will be added to the ignored list.
It is important to note that with such a lock, the caller will hear short beeps, and then a reset, or a message about the unavailability of the subscriber, depending on the operator's settings. SMS-Messages from a blocked contact will also not come to the standard message app.
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If you accidentally blocked an important number, you can unlock it in the same menu by selecting the "Unblock" item in the contact card.
There is an alternative way to configure the Security app itself, which gives you deeper control, but for a one-time lock, the contact method is the most efficient and easy solution for any user.
To fine-tune the filtering of calls and messages in Xiaomi smartphones, there is a special application “Security”, which is where the main tools for protection against spam and fraud are concentrated, access to these settings allows you to manage lists en masse.
Run the Security app (green shield icon) and scroll down to the Antivirus section or look for Lock. In some firmware versions, this section may be called Blacklist, and here you will see the full statistics of blocked events.
Clicking on the settings (cogs) in the upper right corner of this menu will take you to the extended control menu, where you can not only add numbers manually, but also adjust the rules for hidden numbers or numbers from other regions, which is critical for those who often travel.
- 📞 Manual Addition: Allows you to enter a number manually or select from a call history.
- 🚫 Prefixed blocking: the ability to prohibit calls from a whole group of numbers (for example, starting with a certain code).
- 🔒 Do Not Disturb: Integration with System Silence Mode for Total Isolation.
⚠️ Note: When you reset your phone to factory settings, the numbers stored in the local blacklist can be deleted.
Using a security center gives you the advantage of centralized control, and you can always go in here and see who tried to reach you, even if the notifications were hidden.
📊 How often do spammers call you?
Every day.
A couple times a week.
Rarely.
No calls at all.
Use of the Antispam function and databases
In modern versions of MIUI and HyperOS, the lock function is closely integrated with cloud databases, which means that your phone can automatically detect and block numbers flagged by other users as spam, advertising or fraud.
To activate this feature, go to Security → Antispam → Settings (cogs). Make sure the Database Update switch is on. The system will periodically download the current lists of fraudsters' phone numbers.
You can adjust the level of filter aggression, for example, you can choose to lock only those numbers that are marked as "Fraud", or block anything that has a "Advertising" label, which is a flexible setting to avoid missing important calls from couriers.
The way to settings: Security → Antispam → Settings → Update blacklist
A feature of smart antispam is its ability to analyze behavioral factors, and if a number makes many calls in a short time, the system may suggest blocking it proactively, even if it is not already in the global database.
How do cloud bases work?
Cloud databases are built on the basis of user complaints, and when enough people flag a number as spam, it is listed and sent to the devices of all Xiaomi users using this feature.> Blocking hidden numbers and unknown contacts One of the most annoying problems is calling from hidden numbers (No). ID») The standard blacklist requires a specific number, but Xiaomi offers a solution for anonymous people, too. In the Lock menu, find the Lock settings section, where you often have the option to Lock Hidden Numbers or Block Unknowns. Activation of this setting will cause any call that does not have a number definition (Caller) ID), It will automatically deflect. Be careful with this function. Some organizations, banks, or important services may use hidden numbers for outgoing calls (though this is becoming rare), and there may be problems if you expect a call from a person who has a number antidetector service. Number type Blocking Method Skip risk Important Specific Number Addition to Emergency Low Hidden Number Filtration settings Medium All unknown Mode Only of Contacts High International Spam Blocking by Prefix Low For maximum protection, you can combine methods. For example, keep the hidden number lock on, but temporarily turn it off if you're waiting for an important anonymous call from a doctor or specialist. SMS-Spam attacks not only through calls, but also through SMS. Marketing of banks, shops and services can be filled inbox. Xiaomi phones have a smart filter that sorts messages and blocks unwanted keywords. Go to the Messages app, click on the menu or settings icon, and select Antispam Settings (or Spam Filter). You can enable blocking messages from unknown senders, and you can also add words like "share," "credit," "win," "bet." Any message containing these words in the text will be automatically moved to the Spam folder and will not cause an audible notification. 📩 Smart Sorting: The System Determines Advertising SMS pattern-based. 🔑 User words: You set the triggers to block. 🗑️ Auto Delete: the ability to set up automatic spam folder cleaning. ⚠️ Be careful with your keywords. If you add the word code, you may miss an important word. SMS Checking the Spam folder in messages should become a regular habit, sometimes important notifications from delivery or booking services that the system mistakenly classified as advertising get there. ☑️ Checking settings SMSEnable spam filter Check keyword list Clean spam folder Add important numbers to whitelist: 0 / 4 Do Not Disturb as a Temporary Blacklist Sometimes it doesn't require permanent lockdown, but temporary silence» (DND). Unlike a blacklist that blocks specific people, DND It blocks all incoming signals except for favorites, and you can activate the mode through the notification curtain or in the Sound and Vibration settings». In the Do Not Disturb mode settings, you can create an exception list, such as allowing repeated calls (if the same person calls twice within 3 minutes, the second call will pass), which is a useful feature for meetings, movies or night time. You can set up automatic schedule activation so that the phone itself goes into "quiet" mode at night, skipping only emergency calls. → Sound and vibration → Don't disturb. → Schedule It's important to distinguish between these concepts: a blacklist is a "wall" for specific enemies, and "Do Not Disturb" is a "earplug" for the whole world except for friends. Flexible use of both tools provides complete control over communication. Frequently asked questions (FAQ) Will a person see that they are blacklisted on Xiaomi? direct notification system does not send. For the caller, this looks like a normal call reset or horn, after which no one picks up the phone. SMS They also don't deliver, but the delivery report may not come, which will indirectly indicate a problem. SMS If a message is blocked and it gets into the Spam or Locked folder inside the application, it can be restored by moving it to Inbox, and if you clear the folder of blocked messages, you can't restore them with standard means. Is the blacklist reset when you update? MIUI? In the event of a planned system upgrade (OTA) The blacklist settings are usually saved, but when you flash the phone with full Wipe Data or when you switch from the phone to the phone. MIUI On HyperOS with reset, the list can be lost. How to add many numbers to the blacklist at once? Mass addition is possible through importing the file. Create a text file with a list of numbers, save it to your phone’s memory, then in the Security app → Lock → Settings, select Import Numbers from File.