Xiaomi’s current smartphones, which run MIUI shells or the new HyperOS, have powerful built-in tools to filter incoming traffic. Many users face intrusive advertising, spam from banks or calls from scammers, making it a hot topic to turn on locks. Unlike “clean” Android, which often requires third-party apps, Xiaomi’s ecosystem integrates these features at the system level.
Effective incoming call management not only keeps you calm, but also prevents accidental financial losses. The standard blacklist in Redmi and Poco devices is flexible enough to allow you to create exception lists or block entire groups of subscribers.
In this article, we will take a look at all the available methods for limiting calls, from basic settings to advanced scripts through service codes. You will learn how to set up automatic response, block hidden numbers, and use the capabilities of the Security app. A key feature of MIUI is that locking works even without installing additional number-defining applications.
Using a built-in blacklist through the Phone app
The easiest and fastest way to limit unwanted calls is to use the functionality of the standard Phone application, which is ideal for blocking specific numbers that have already called you or are known as spam.
Find the number you want to block in the list. Make a long tap (tap and hold) on the contact name or number numbers. In the context menu that appears, select the option Add to the blacklist. After that, the system automatically puts the subscriber in the ignored list, and you will no longer hear the beeps when they call.
If you need to manually manage a list or check its contents, go to the app settings. Click on the three dots in the corner of the screen or the menu button, then select Settings → Lock. Here you will see a full list of blocked contacts and you can add new ones manually, entering a number or selecting from the phone book.
It is important to note that the location of items may vary slightly from one MIUI to another, and in some firmwares, the blacklist button is immediately in the incoming call card if you swipe left or click on the information icon (i), which speeds up the process of responding to calls from unknown numbers.
Configure the locking rules in the Security application
Xiaomi’s smart phones use the Security system app to fine-tune their call filtering, and this is where the main spam and fraud protection tools are concentrated. Open the app with a distinctive shield on a green background and find the Antispam (or Block) section.
Inside this section, you have powerful settings that allow you to block not only specific numbers, but also entire categories of calls. For example, you can disable calls from hidden numbers or from all unknown contacts. To access these functions, click on the gear settings in the upper right corner of the screen.
The following important options are available here:
- 📞 Unknown Number Blocking: Bans calls from people who aren’t in your phone book.
- 🔒 Hidden Number Blocking: Cuts off calls where the number detector is disabled by the sender.
- 🌍 Region-code blocking: allows you to block calls from certain countries (e.g, +7 for Russia, +380 for Ukraine, etc.).
💡
Turn on the “Block First Caller” feature in Antispeem settings if you are attacked by autocall – this will prohibit calls from numbers from which you have never called yourself.
Activating these features requires care, and if you turn on locking all unknown numbers, courier services or clinic doctors may not get to you, so the safest option is to use a spam database that is automatically updated through the Xiaomi cloud.
Deep customization through engineering menus and codes
For advanced users who want to access hidden telephony functions, there is the possibility of using special telephony features. USSD-However, be careful: changing system parameters can affect the stability of the communication module. The standard code for entering the verification menu is # # #4636##, but it does not always open access to locks.
A more effective way is to use forwarding commands that emulate the operator-level lock, for example, to reject all voice calls, you can type in a command:
**67*[voice number]#But in the context of internal locking Xiaomi, the most useful is the code reset call settings, if the lock menu “gluts”:
##002#There is also a hidden CIT (Factory Mode) menu available under the code ##6484##. Although it is designed for diagnostics, in some versions of firmware through it you can check the microphone and speakers, which indirectly affects the quality of the function “Deflect call” (if the speaker does not work, you will not hear the beeps, but the lock will work).
⚠️ Note: Do not change the values in the Engineering Mode unless you are sure of their purpose.Resetting the radio module settings may cause network signal loss or failure. SIM-map.
If standard methods don’t work, try clearing the phone app data. Go to Settings → Apps → All Apps → Find Phone → Clean → Clear Everything. This will return call settings to factory values, often eliminating software lock errors.
Automatic response and "Do Not Disturb" mode
Sometimes you don't need to block a call completely, but you can't take it right now, and in those cases, it's convenient for Xiaomi to use the Auto Reply feature, which allows the smartphone to drop the call or send it by itself. SMS-pre-submitted.
To set up this feature, go to Settings → Special Options → Autoresponse. You can turn on the mode where the phone will drop a call after a certain number of beeps or send a message like “I’m busy now, I’ll call you later,” which is especially useful for drivers or during meetings.
The alternative is Do Not Disturb, which, unlike the blacklist, blocks sound and vibration for all calls except those marked as "Favorites," which can be activated through the notification curtain or in the Sound and Vibration settings.
☑️ Checking the silence settings
It is important to distinguish between these concepts: the blacklist actively rejects the call (the caller hears the beeps, then the reset), and the Do Not disturb just prevents the phone from calling you, but the call passes (or goes to the operator's answering machine).
Comparison of locking methods on Xiaomi
Once you've figured out the different ways to limit calls, it's useful to systematize your knowledge.