Android Blacklist on Xiaomi: Location and Management

Xiaomi smartphone owners often face the challenge of limiting communication with certain subscribers, whether it’s intrusive advertising calls or contacts from the past. The standard shell of MIUI, and now HyperOS, offers built-in tools to filter incoming connections that work more efficiently than many third-party applications. However, the system interface is so full of features that not all users can find the right partition the first time, especially after updates.

The main locking tool in Xiaomi’s ecosystem is the built-in Security app, which is integrated deep into the system and has access to system calls. This is where the functionality to create a blacklist, configure Do Not Disturb mode and filter spam messages hides. Understanding the logic of this application is key to effectively managing incoming traffic.

Unlike pure Android, where lock settings are often scattered across the phone’s menu, Xiaomi engineers have centralized all security features in one place, so that the user can flexibly adjust the rules, such as blocking only hidden numbers or skipping only contacts from the phone book. The lock function works at the system level, so the blocked subscriber will not hear the beeps, and you will not see missed calls in the standard log.

Location of the function in the Security application

To access lock settings, you need to run a standard system application, which is usually called “Security” and a green shield icon, preinstalled on all Redmi and Poco devices and is the central node for managing permissions and access. In the window that opens, you will need to scroll down the tool list to the Tools section, where the option is located.

Interestingly, menus can look different depending on the regional version of firmware. Global ROMs often call it “Blocking,” whereas in Chinese builds, it can be hidden inside the antivirus submenu or call settings. If you don’t see the right item, search the search bar at the top of the Security app and type in the word “Blocking.”

⚠️ Note: Do not remove the Security or Security app from your device, even if the system offers such a feature.This is a system component and deleting it can cause calls to malfunction and number glitch.

Once you log in to the Lock section, you will see a control panel that displays all blocked events, not only the numbers added to the blacklist, but also the history of communication attempts that were rejected by the system. To move to the full list of prohibited contacts, you need to click on the gear icon or menu button in the upper right corner of the screen.

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If you’ve upgraded to HyperOS and can’t find settings, search your phone’s settings by entering “Call Lock” is the quickest way to get to the menu you want.

Adding numbers to the blacklist

The process of adding an unwanted subscriber to a blacklist on Xiaomi is as simple as possible and can be done in several ways: the fastest method is to add directly from the call log or contact list, just open the call history, find the desired number, click on it to open the additional menu and select the item "Add to the blacklist".

Alternatively, you can manually add it through the Security app, which is useful if you want to block a number that isn't in your phone book, or if you need to make multiple entries at once. From the lock menu, select Add and enter the number manually or select it from a list of recent calls, and the system also allows you to block entire ranges of numbers or hide numbers without definition.

For advanced users, the function of blocking keywords in SMS is available. This is especially important for combating advertising mailings. In the message blocking settings, you can create a rule that will automatically place any messages containing certain words, such as “credit”, “winning” or bank names, in spam.

Importantly, when you add a contact to the blacklist, the system will ask you to choose a lockdown scenario, you can simply drop calls, send a busy signal to the subscriber, or you can not give any reaction at all, simulating a phone that is turned off, and the choice of strategy depends on whether you want the caller to understand the fact of the lockdown.

Managing a list of blocked contacts

The management of the lineup (blacklist) requires periodic review as situations change and numbers that were previously unwanted can become relevant again. To view the full list of prohibited subscribers, go to the lock settings and select "Blacklist" and it displays all the numbers that have been activated the ban.

To remove a number from the list, just click on it and select the option “Delete” or use the mass control function, highlighting several entries at once. This action immediately restores the ability to communicate with this subscriber. Also, the “Clear All” function is available in this menu, which will completely reset all lock settings, returning the list to its original state.

Special attention should be paid to the section “Block History” where logs of all attempts of communication from blocked numbers are stored, you can see the time of the call, the type of connection (voice call or SMS) and the contents of the message, if it was text, which allows you to control who tried to reach you and when, even if you did not hear the call.

| Action | The Way in the menu | Result |

|:--- |:--- |:--- |

| View list | Security → Lock → Blacklist | Display all blocked numbers |

| Adding number | Call log → Number → Add to emergency | Number entered in the ban database |

| Clear History | Block → Settings → Clear History | Delete Blocked Event Logs |

| Rule settings | Block → Settings → Rules | Creating filters by keywords |

Set up filtering rules and modes

Xiaomi’s security flexibility allows you to create complex incoming traffic filtering scenarios. In the “Rules” section, you can activate the “Block All” mode, which will disable all incoming calls except those on the White List. This is ideal for situations where complete silence is required, but important contacts should be able to reach.

The contacts added to this group take precedence over any locking rules, and even if total lock or Do Not Disturb mode is activated, calls from selected contacts will pass, and the phone will vibrate or make a sound, depending on the profile settings.

To combat international spam or fraud, you can activate the “Block Hidden Numbers” filter, which is useful because many automated callers hide their ID. However, be careful: enabling this option can lead to the skipping of important calls from delivery services or employees of organizations using corporate PBX with a hidden number.

⚠️ Warning: Do Not Disturb and Blacklist are different features. The blacklist locks specific subscribers at all times, and the Do Not Disturb mode blocks everyone except the select few, but only at a predetermined time.

Smart Lock is also available, which uses a cloud database to identify spam numbers, and when enabled, the phone will automatically check the incoming number against a database of known scammers and advertising agencies, marking such calls in red or resetting them automatically.

Alternative methods of blocking through Google

In addition to the built-in MIUI, any modern Android smartphone has Google’s standard lock mechanism, which is less functional in terms of fine-tuning, but is reliable and syncs with your account. To use it, open the standard Google Dialer app, go to the settings (three dots in the corner), and select “Blocked numbers”.

You can turn on the “Filter Spam” option here, which will automatically detect and block suspicious calls based on Google’s database. This method is good because it is independent of the manufacturer’s shell and works the same for Xiaomi, Samsung and other brands. However, the history of blocked calls here is less detailed than in the “Security” app.

Using third-party apps like Truecaller or Getcontact is another option, but it requires broad permissions to access your contacts and calls. Xiaomi's built-in tools do just as well in most cases while keeping data private inside the device.

Frequent problems and their solution

Users sometimes experience a situation where the number added to the blacklist continues to be dialed, most often because the lock was not applied to a specific type of call (for example, only voice, not video call, or vice versa) Check the rule settings and make sure that the tick is opposite the correct type of communication.

Another common problem is the lack of notifications about blocked messages. If you don’t see SMS from blocked senders in the lock log, check if the filter is worth displaying only voice calls. It’s also worth making sure that the Security app has all the necessary permissions and has not been “sleeped” in the background due to aggressive battery optimization.

In rare cases, after a firmware update, lock settings can reset, a well-known feature of some versions of HyperOS, where in a major Android update, privacy settings are re-initiated, in which case you will have to re-enter important numbers in the blacklist.

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The locking system on Xiaomi works at a low kernel level, so it does not require keeping the Security app running in the background to work properly – it works autonomously.

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