How to block the number on Xiaomi: the complete guide

In the digital age, the smartphone has become our main window into the world, but with useful notifications, it also misses a lot of unwanted noise. Intrusive calls from collectors, spam from marketing agencies or simply communicating with unpleasant people can seriously disrupt the peace of mind and work rhythm. Owners of Xiaomi, Redmi and POCO devices often wonder how to effectively limit the access of unwanted contacts without resorting to complex technical manipulation.

Fortunately, the operating system MIUI HyperOS and its successor, HyperOS, have built-in powerful traffic filtering tools that are often more effective than third-party solutions. Locking a number on Xiaomi is not just removing a contact from the phone book, but creating a reliable barrier at the system level that will prevent the receipt of calls and calls. SMS-In this article, we will discuss in detail all available methods, from simple settings to advanced blocking scenarios.

Understanding the mechanisms of the blacklist will help you not only get rid of current problems, but also competently adjust the protection for the future. SIM-So, the whole isolation of the unwanted subscriber requires the right approach, which we're going to describe now.

Use of the built-in lock function in MIUI

The easiest and most reliable way to lock a number on Xiaomi is in the standard Phone app. Xiaomi developers have integrated the Antispam functionality directly into the base call, which saves the user from having to install additional applications. This method works at the system level, so the blocked subscriber will not be able to reach you even if the phone is in sleep mode.

To start blocking, you need to open a call log or contact list. Find the number that is causing inconvenience. When you click on it or swipe right (depending on the version of MIUI), a contact card or action menu will open. Here you should look for an option marked as “Block” or the icon of the crossed-out circle. Once confirmed, the number automatically goes into the blacklist.

It is important to note that in some regions and firmware versions, the menu may differ. If you do not see a direct lock button in the contact card, click on the three dots in the upper right corner of the call screen. In the drop-down menu, select "Blocking Settings" or "Add to a blacklist." The system may suggest that you choose a lock scenario: only calls, only SMS, or a complete communication ban.

• 📞 Open the Phone app and go to the call log.
• 👆 Click on the desired number or select it from the contact list.
• ⚙️ Find the menu item “Block” or “Add to the blacklist».
• ✅ Confirm the action in the pop-up window.

Once you do this, the lock will take effect immediately, and the blocked user will hear long beeps or a message that the caller is unavailable, depending on your carrier's settings, and you will not receive any notification of missed calls or messages from that contact, which ensures complete digital peace.

Set up a blacklist through the security center

More in-depth call filtering is managed through the system application Security, which is the central hub for all the security settings of your Xiaomi device, where you can not only add individual numbers, but also configure rules for entire contact groups, for example, block all hidden numbers or calls from unknown identifiers.

To get to the right section, open the Security app with the green shield icon. Scroll down to the Antispam or Lock box. That's where your system's full blacklist is located. The interface may vary depending on the version of HyperOS or MIUI, but the logic remains the same: managing lists of allowed and prohibited contacts.

Inside the Antispam menu, you'll find the Blacklist tab, and by clicking on the plus or Add button, you can manually enter your phone number, select it from your contacts, or add it from your call history. Special attention should be paid to the keyword blocking settings in SMS, a powerful tool for combating advertising mailings that users often ignore.

⚠️ Note: When you add a number to a blacklist through the security center, make sure you do not activate Do Not Disturb mode for all unknown numbers if you are expecting an important call from an unfamiliar phone (such as a courier or doctor).

In addition, you can set up a whitelist in this section, and the contacts you make will be able to reach you even if you have silenced or blocked all incomings, a critical feature for situations where you need to cut off all spam, but remain accessible to a narrow circle of people.

Blocking Unknown and Hidden Numbers

A separate category of nuisance calls are calls from unknown numbers or when a subscriber hides his ID. Xiaomi has a feature that allows you to block such calls automatically, this is especially true during the period of activity of telephone scammers who often use number masking technologies.

To activate this feature, go back to the Antispam menu in the Security app. Find settings (usually a gear in the corner) and select "Block Unknown Numbers" or "Block Hidden Numbers." Once the slider is activated, the system will automatically reject any calls where the phone number has not been determined.

It’s worth considering that this feature may be too aggressive for some users, for example, if you may be called from clinics, banks or government services from corporate numbers, which are sometimes defined as “Unknown.” So use this tool with caution, weighing all the pros and cons.

• 🛡️ Go to the Security Appendix» → «Antispam».
• ⚙️ Open the settings (cogs) in the upper right corner.
• 🚫 Activate the switch "Block hidden numbers».
• 📝 If necessary, add exceptions to the whitelist.

Hidden numbers are a particular threat, as they cannot be returned by a call or added to a regular blacklist by numbers. The only way to deal with them is preventive system lock at the operator or smartphone level, as described above. In modern versions of MIUI, algorithms for determining such calls work quite correctly, without cutting off legitimate calls.

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If you are waiting for an important call from an organization from a hidden number, temporarily disable this feature or ask the interlocutor to introduce himself via SMS or messenger before the call.

Use of third-party applications for filtering

While Xiaomi’s built-in tools are highly effective, sometimes a more flexible approach is required, which third-party developers can offer: apps like Truecaller, Calls Blacklist or Should I Answer? have huge databases of spam numbers that are updated in real time by the community of users.

Installing such an app on Xiaomi requires careful permission settings. Android and MIUI are very strict about accessing calls and contacts. Once installed, you will need to give the app permission to read the call log, contacts and, critically, the right to “Above Other Applications” to display the number detector during an incoming call.

The main advantage of third-party solutions is cloud databases, and while you sleep, other users tag the fraudsters' numbers, and this information is instantly available to you, but it's worth remembering privacy: by transferring data to the cloud of such services, you potentially share your contact list.

When using third-party software, there is often a conflict with the Xiaomi system call. To avoid problems, in the phone settings, you need to install a new application as the “Default App” for determining the number and Caller ID. Without this step, the lock may not work at the right time.

Blocking through the operator

If the software methods on the Xiaomi smartphone seem to you not reliable enough, you can always turn to the source of the signal - your carrier. The largest operators (the Big Four in Russia and analogues in the CIS) provide services for blocking unwanted numbers at the network level.

The advantage of this method is that the call does not even reach your phone without using up battery power and creating unnecessary traffic, a service that can be called Antispam, Blacklist or Parental Control, which is usually provided on a paid basis with a daily or monthly subscription fee.

Services can be used to connect USSD-For example, for some operators, the activation command looks like a mobile application *111*001# (If you connect, you can manage the list of blocked numbers through the menu of your personal account or answer rooms. SMS.

It is important to understand the difference between a phone lock and a network lock: Network lock often gives no feedback to the caller (the beeps go on endlessly), whereas the phone can immediately reset the call. In addition, operator services sometimes have restrictions on the number of numbers blocked (usually up to 10-20 pieces for free).

⚠️ Attention: Number locking services are often paid.Before activation, carefully examine the rates to avoid unexpected charges from the main account.

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Network locking through the operator is the most reliable way, as the call is filtered out before it reaches your device, saving smartphone resources.

Frequent problems and ways to solve them

Despite the cleverness of the system, Xiaomi users sometimes face situations when the lock does not work properly, most often due to the peculiarities of the Android operating system, which in order to save energy can “kill” the background processes responsible for filtering calls.

If you notice that locked numbers are still going through, check your battery settings. Go to Settings → Apps → All apps, find the Security app or your call. In the charge saving section, select No Limits mode. This will prevent the system from unloading the locking process from memory.

Another common problem is synchronizing blacklist between SIM-On two-sym Xiaomi, settings can only be applied to one SIM card or work incorrectly when switching the (default) SIM for calls. In such cases, it is recommended to duplicate the settings in the menu of each SIM card separately, if the interface allows you to use the SIM card.

Also worth mentioning are crashes after a firmware update. Major MIUI updates or a switch to HyperOS can reset some user security settings. So after a major system update, it's always a good idea to check if your blacklist is active and add numbers again if necessary.

• 🔋 Check if the background activity limit is worth it for system services.
• 📱 Make sure the lock is set up for both SIM-map.
• 🔄 After updating the firmware recheck the settings "Antispam».
• 📞 Test the lock from another phone before relying on it.

The critical point is that when you reset your phone to a factory setting, the entire blacklist will be permanently deleted. If you keep a thorough list of unwanted contacts, it makes sense to periodically take a screenshot or write out numbers to quickly restore protection after the remodel.

Questions and Answers (FAQ)