How to block unknown numbers on Xiaomi

In today’s digital world, the smartphone has become not only a means of communication, but also a repository of sensitive information that scammers seek to access. Owners of devices based on the MIUI shell and the new HyperOS often face intrusive calls from advertising agents or phone scammers using hidden numbers. Locking down unknown subscribers becomes a critical feature for mental health and financial security.

The Android system that powers Xiaomi, Redmi and POCO phones provides powerful built-in call filtering tools that don’t require third-party software. However, it can be difficult to find these settings due to deep menu immersion or differences in firmware versions. In this article, we’ll take a closer look at all the ways to isolate yourself from unwanted communication.

Ignoring the problem can cause you to miss a really important call from a doctor or courier if they call from a hidden number, so setting up a blacklist and activating spam protection features is the first thing you need to do after you buy a new device. Let's look at the algorithms of actions.

Use of built-in antither and blacklist

The first and most effective tool is the standard Security app, which is pre-installed on every smartphone of the brand, and this is where the main levers of incoming traffic are concentrated. To get started, you need to open the application with the green shield icon, which is the default in the Tools folder or on the home screen.

Inside the security menu, you'll find the Antispam section, and here you'll find flexible filtering settings, and if you want to completely cut off calls from numbers that aren't saved in your phone book, you'll need to activate the appropriate switch, and the locking algorithm is system-level, so the call won't pass, and the caller will hear the "busy" signal.

It is important to note that the location of elements may vary slightly between versions of MIUI, and in some cases you need to click on three dots in the upper right corner or select Settings (cogs) inside the anti-spam section, and that's where the "Block Unknown Numbers" switch is hidden.

Once activated, all calls from numbers that are not in the contacts will automatically be rejected, a radical but powerful method that is often used by people tired of the daily flow of advertising, but this approach has its own nuances that you should know about in advance.

Blocking through the standard application “Phone”

An alternative way to manage calls is through the native dialing app, which is more suitable for those who are used to working directly with the call log. Open the phone app (green handset) and go to the menu called by pressing three dots or stripes.

In the drop-down list, select Settings, and then look for Lock or Blacklist, where the interface can vary depending on whether you use Google Dialer or Xiaomi's branded call, in both cases, the functionality allows you to create filtering rules.

If you use a standard MIUI, the lock section often includes the option “Block Hidden Numbers” and activation of this feature prevents calls from those who use special services to mask their ID, which is especially important for dealing with collectors and scammers.

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If you are waiting for an important call from an unfamiliar number (for example, from a courier), temporarily disable the lock of unknowns to avoid missing delivery.

It's also worth mentioning the feature, "Silent mode for unknowns." Unlike full lock, it doesn't reset the call, it just doesn't make sound and vibrations, sending a call straight to the history of the missed, which avoids noise, but leaves the possibility of calling back later if the call was important.

Filtering settings in Google Telephony

Many of Xiaomi’s current models, especially the global versions, come pre-installed with the Google Phone app. This app has its own, very smart spam protection system that runs in the cloud. To access these settings, open the app and click on the three dots in the top right corner.

Select Settings, then go to Number Defineer and Spam, and here you will see the Filter Spam Call switch, and when you activate this feature, the phone will analyze incoming calls in real time, checking them against Google's huge database, and if the number is tagged as spam by other users, the call will be automatically rejected.

In addition, the "Hide suspicious spam calls" option is often available on the same menu, meaning that the phone won't even ring or vibrate, but will simply record the event in a separate section of the log.

Use of third-party applications for protection

Built-in tools are sometimes not enough, especially if spam attacks are massive and numbers are constantly changing, and in such cases, specialized applications like Truecaller, GetContact or Yandex with a number determinant come to the rescue, and these programs have their own giant databases.

The principle behind this is crowdsourcing, where users label numbers as spam, telemarketing, or fraud. When you get a call, the app instantly checks its database. If the number is illuminated, the call is blocked before the phone even rings, which creates an additional layer of intellectual protection.

But using these apps requires broad permissions, including access to all contacts and a call log, raising questions about the privacy of your personal data. Before you install them, weigh the risks: Are you willing to trade some privacy for silence?

⚠️ Note: By installing third-party number detectors, you agree to transfer your contacts to the developer's servers.

For maximum efficiency, it is recommended to combine methods, such as leaving Xiaomi’s system filter on for basic protection and using an app like Truecaller only to check unknown numbers, not giving it the right to automatically drop calls if you fear for it.

Registration in the register of unwanted subscribers

In addition to device-level blocking, there is a legal method to combat spam, such as the launch of a service called “Robot Secretary” from operators or the possibility of filing complaints to the register of unwanted subscribers (if such functionality is supported by your operator).

Large telecom operators (MTS, Beeline, MegaFon, Tele2) They offer paid and free spam protection services, which are network-based, meaning that the call doesn't even reach your smartphone, saving you battery power, and you can connect them through the operator's personal account or USSD-team.

Network lock activation is often more reliable than software, since spammers cannot bypass the carrier-side lock by simply changing the SIM card on the phone if the fact of calling your number for certain traffic signs is blocked.

Analysis of blocked calls and management of the list

Periodically, you need to check the log of blocked calls to make sure the system is working correctly and doesn't miss important calls.The Security or Phone app usually has a separate tab or section marked as "Blocked" or "Spam."

Here you can see a list of all the communication attempts that were rejected. If you notice a number there that was supposed to pass (for example, a call from an old friend from a new number), you can add it to the whitelist.

To add to the whitelist, you usually need to click on the number, select the option “Add to exceptions” or “Allow”, and then this subscriber will be able to reach you even when the “Do not disturb” mode is turned on or strict filtering of unknowns is strictly possible.

Cleaning the blacklist regularly is also helpful, and if you blocked a number incorrectly or things changed, removing it from the blacklist will restore connectivity, and managing those lists is a key skill for a literate Android user.

Frequently Asked Questions (FAQ)

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A comprehensive approach, including phone settings, application-definitions and operator services, gives a 99% guarantee of protection against intrusive calls.

To sum up, the Xiaomi owner’s arsenal of spam control tools is extremely broad, from simple security menu settings to Google’s smart cloud filters, and using them properly will allow you to forget about intrusive advertising and focus on the things that matter, and don’t neglect setting up digital hygiene, because your time and nerves are worth protecting.

Remember that technology changes and spammers become more sophisticated. Regularly update antivirus databases and follow the news in the MIUI updates section, where Xiaomi engineers are constantly improving algorithms for detecting unwanted traffic. Be vigilant and safe in the digital space.

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To check the effectiveness of the lock, ask a friend to call you from a number that is not in your phone book while you test Unknown Lock mode.