How to Add a Number to the Blacklist on Xiaomi: A Step-by-Step Guide

Modern users of Xiaomi smartphones often face intrusive calls from advertising agencies, banking services or scammers. An effective tool to protect against such information noise is the blacklist function, which is built into the shell of MIUI and HyperOS. Activation of this option allows you to completely isolate the owner of the gadget from unwanted communication, blocking incoming calls and messages from certain numbers.

Unlike simple contact books, the system blocker on Xiaomi works on a deeper level, intercepting the connection even before the phone starts to emit sound or vibration. This not only keeps your nerves out, but also prevents random responses to spam. In this article, we will detail how to configure call filtering so that your smartphone ceases to be a channel for advertising.

It is worth noting that the security algorithms may vary slightly depending on the version of the Android operating system and the regional firmware, but the general principle of operation remains unchanged: the system checks the incoming number against the database of prohibited contacts and automatically rejects the connection.

Use of the built-in Security application

The most reliable way to lock does not require installing third-party software, since every Xiaomi smartphone already has a powerful system module preinstalled, it is integrated directly into the core of the system, which ensures stable operation even when you reboot the device. To start, you need to find an application called Security and a green shield on your desktop or in the Tools folder.

Once you start the program, scroll down to the section that blocks unwanted content, and depending on the version of the interface, this item may be called Antispam or have a cross-circuit shield icon, and that's where all the tools for managing incoming traffic and filtering calls are concentrated.

Inside the anti-spam menu, you'll see a few switches and buttons, and we're interested in adding specific numbers to the exception, and the system allows you to flexibly adjust the rules: you can block all hidden numbers, all unknown subscribers, or create a personalized list of favorites to ignore. Xiaomi's system blocker intercepts the call to the tone, so the subscriber will hear the "busy" signal.

⚠️ Note: When enabling locking all unknown numbers, make sure you don’t expect important calls from couriers or delivery services that may be calling from hidden or city numbers.

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Periodically check the lock log in the Security app to make sure the system doesn’t miss important calls from real people mistaken for spam.

To go manually, click the corresponding button at the bottom of the screen or in the settings menu (three dots or gears). This opens an interface that displays all blocked calls and manually added contacts. This is your digital security management center.

Manual addition of contacts through call log

Often, there is a situation when you urgently need to block the number from which the annoying call just came, in which case you do not need to go to the deep settings menu, since MIUI offers quick access to the lock function directly from the call history, which greatly speeds up the process of responding to spam.

Open the standard Phone app and go to the call history tab. Find the number you want to blacklist in the list. Click on it to reveal the additional action menu. In the option list that appears, select "Block" or "Add to blacklist."

The system will immediately confirm the action, and from that point on all attempts to communicate from this number will be interrupted, and if you accidentally blocked the wrong number, the procedure can be easily canceled by returning to the lock settings. Also in the call menu, the option “Blocking settings” is often available, which allows you to clarify details, for example, whether to block the device. SMS-message from this number.

• 📞 Open the Phone app and go to the call log.
• 📝 Click on the desired number or information icon next to it.
• 🚫 Select the “Block” option in the menu that appears.
• ✅ Confirm the action in the system dialog window.

This is especially useful when you need to respond quickly to an attack with spam calls, you just drop the phone or don't pick it up, and then instantly enter the number in the database of prohibited, it takes only a few seconds and does not require technical knowledge.

Blocking through the contact menu

If you have a number already saved in your phone book, but you're no longer interested in communicating with that person or organization, you can use the contacts menu itself, which is convenient because you can see who owns the number and don't confuse the subscriber. The contacts interface on Xiaomi also has built-in security features.

Go to the Contacts app and find the entry you want. Open the subscriber card. At the bottom of the screen or menu (three dots in the corner) there should be a "Block" button. When you click on it, you mark this contact as unwanted, and then any attempts to communicate will be ignored by the system.

It's important to understand the difference between deleting a contact and blocking it. Deleting it just erases the entry from the book, but calls from that number will still pass. Blocking it creates an active barrier, and you can simultaneously delete the number from the visible part of the book and add it to the blacklist through the app's settings.

You can use a web interface or sync with your Google account for mass contact management, but local locking on your Xiaomi device is a priority, and even if the contact is synchronized, the system ban on calls will remain in effect until it is removed.

Configure the rules of blocking and filters

The security features on Redmi and POCO smartphones allow you to create complex filtering rules that go beyond a simple number list, you can set up automatic locking of all calls containing certain numbers, or turn off the sound for all numbers not saved in contacts.

To access the advanced settings, go to Security -> Antispam -> Menu (three dots) -> Settings. This is the Lock Rules section. By turning on the Block Calls from Unknown Numbers switch, you create a whitelist where only your contacts will go. Everyone else will automatically be rejected.

Keyword blocking is also available in SMS. If you often receive promotional messages with phrases like “Credit”, “Win” or “Promotion”, add these words to the filter. The system will automatically hide such messages without disturbing you with notifications. This is a powerful tool for cleaning the information space.

Remember to update keyword lists periodically, as spammers are constantly changing tactics and wording. Flexible filter settings allow you to adapt your smartphone to current threats.

Use of third-party applications and databases

While Xiaomi’s built-in tools are powerful, external databases are sometimes required to identify spam, and apps like Truecaller or Yandex (with a detector function) can automatically tag calls from telemarketers and suggest blocking them.

When you install these apps, Android will ask permission to access calls and contacts, which is necessary for the number detection function to work, and once installed, you can set up automatic locking of numbers marked by other users as Spam or Fraudsters.

However, privacy is important to remember: Third-party apps often upload your contacts to their servers for analysis, and the built-in MIUI blocker works locally and does not share your calls with third parties, making it more secure from a privacy perspective.

• 📲 Download the app-definition from Google Play.
• ⚙️ Give the necessary permissions in the system settings.
• 🛡️ Enable the function of automatic spam blocking in the application settings.
• 🔄 Regularly update the database of the determinant.

Checking the list and managing exceptions

From time to time, you need to check the contents of the blacklist to make sure it's up to date, you may have blocked a doctor's number or an important service center, and now you can't get through.

Go to Antispam and select Blacklist, and you will see the full list of blocked numbers, and by clicking on any of them, you can remove it from the list or add it to the exceptions (whitelist) if this option is available in your firmware version, and it also keeps a log of all blocked communication attempts.

The lock log shows the date, time and type of event you blocked (a call or SMS) to help you understand who tried to reach you when, and if you see an important missed call in the log, immediately delete the number from the blacklist and call back.

⚠️ Attention: Clearing the lock log does not remove numbers from the blacklist. To unlock the subscriber, you need to find him in the list of blocked contacts and click "Delete».

Regularly reviewing the list helps to avoid situations where you limit yourself to a significant environment, and be careful when you block prefixes or city codes.

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Regular check of the lock log allows you to unlock important numbers that could be mistaken for spam by the system.

Frequently Asked Questions (FAQ)