Modern smartphone users regularly face intrusive calls from advertising agencies, banking services, or even scammers. Owners of Android devices and MIUI or HyperOS shells have built-in tools to protect against unwanted intrusion into their personal space. Blocking a particular subscriber is the first step to digital peace that does not require the installation of third-party software.
The procedure for restricting access can vary depending on the version of the operating system and the model of your gadget. The lock can be done through a standard phone book, call log or system security settings. It is important to understand that the blocked subscriber will not be able to reach you, and his attempts will either be reset or translated to the answering machine, depending on the settings of your operator.
In this article, we will take a look at all the available methods of isolation from unwanted contacts. We will look at the standard system tools, antivirus capabilities and specific codes of telecom operators. System lock at the MIUI level hides incoming calls and notifications from the contact, making it invisible to the user, which ensures that you do not miss really important calls while distracted by noise.
Blocking through call log and contacts
The fastest way to restrict access is to use your call history. If you just got a call from an unfamiliar or annoying number, you don't have to save it to a book. Open the Phone app and go to the History or Journal tab. Find the right line and click on it to open the context menu.
In the window that opens, you'll see a few options: you'll need to find a button that shows a crossed-out circle or says "Block." Once you press it, the system can request confirmation of the action, and the blacklist will be replenished automatically, and repeated calls will be ignored.
If the number is already saved in your phone book, the algorithm changes a little. Go to the Contacts app, find the right person and open the subscriber card. At the bottom of the screen or in the menu (three dots in the corner), there will be a lock option available. Xiaomi also allows you to send a lock message, but this depends on regional settings.
☑️ Checking lockdown
It's worth noting that when you lock a call log, the number may not be added to the permanent list of banned calls unless you confirm this action in the settings. Always check the final result. Some firmware versions allow you to choose the option "Block all calls" or "Block only SMS", which gives you flexibility in managing communication.
Setting up a blacklist in the Security app
The central access control node in Xiaomi smartphones is the system application Security. This is where all the filters and rules are concentrated. Open the application, find the "Black List" or "Antispam" section, and here you can see the full database of numbers that are not allowed to access your device.
The interface in this section allows you not only to add new numbers, but also to customize behavioral scenarios. You can manually type a number, copy it from the clipboard or select from your call history. Antispam in MIUI works at the system level, so it is more effective than many third-party applications, because it has deep access rights.
⚠️ Note: When you blacklist a number through the Security app, make sure you don’t block important service numbers, such as a delivery or courier service, if you’re waiting for them to call.
In the blacklist settings, you can have advanced filtering features, you can activate Quiet Mode, which will block all calls except those on the whitelist, and you can also have a hidden number lock feature, which is important for dealing with telemarketing.
Check this section regularly to clear old records or to adjust rules. The system allows you to create contact groups, but for a single lock it is redundant, the main advantage of this method is centralized management, where you can see all dialing attempts, even if they were blocked.
Use of smart assistant and MIUI filters
The MIUI shell and the new HyperOS feature intelligent spam recognition algorithms, and the Phone app settings enable the “Detect Organization Numbers” or “Filter Spam” function, and the database updates automatically and flags suspicious calls in red.
To activate these features, go to the call settings (usually a gear or three dots in the phone app). Find the Antispam or Lock section. Here you can enable automatic locking of numbers marked by other users as fraudulent or advertising.
The smart assistant can also analyze subscriber behavior, and if a number rings too often or with short horns, the system can suggest blocking it, and automatic protection can significantly reduce the user's burden by eliminating the need to manually blacklist each number.
How does the spam number database work?
It is important to update the antivirus and anti-spam databases that are built into the system periodically, through the Security app or in the general settings of the system, and without the current databases, the filtering efficiency decreases, and new schemes of fraudsters can pass through the security.
Blocking through operator codes and USSD-request
If the software methods do not give the desired result or you need to block a number at the network level, you can use the services of an operator, Tele2) eat USSD-It allows you to screen out calls before they even reach your smartphone.
Below is a table with the main commands for activating the Blacklist from popular operators.Please note that some services may be paid or have a trial period.
| Operator. | Activation command | Addition command | Cost |
|---|---|---|---|
| MTS | *111*442# | *111*442*7*number# | Paid/Subscriber |
| Beeline | *110*771# | *110*771*number# | Paid/Subscriber |
| Megaphone | *130# | Through an LC or an application | Paid/Subscriber |
| Tele2 | *155*611# | *155*611*number# | Paid/Subscriber |
The use of carrier services has its advantages: a call from a blocked subscriber will not even appear in the log of the missed one, since the network cuts it off. However, list management is often paid, unlike free built-in tools Xiaomi.
To disable a service or delete a number from the operator's list, you usually need to enter the appropriate cancellation command or contact your personal account. SIM-cards, if the operator uses traffic analysis, but against ordinary annoying acquaintances it is better to use phone settings.
Third-party applications for extended protection
In some cases, standard tools may not be enough, especially if the spam attack is massive, and then specialized applications from Google Play, such as Truecaller, Kaspersky Who Calls or Yandex with Alice, come to the rescue, and these programs have their own huge number databases.
Installing such software requires broad permissions to access calls and contacts, so that the application can intercept incoming calls and verify the number against the base, and once installed, it can completely replace the standard dialing interface.
⚠️ Note: By installing third-party number detectors, you agree to the developer’s privacy policy. Often, these applications collect data about your contacts to replenish the general database.
Third-party solutions have the advantage of cross-platforming and more aggressive search algorithms, which can block not only by number, but also by keywords in the contact name or by geolocation of the caller. Truecaller, for example, allows you to create complex lock scenarios that are not available in standard firmware.
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If you use a third-party number detector, disable Xiaomi’s standard lock to avoid conflicts and double notifications of blocked calls.
You don't have to install multiple apps at once, they're going to be in conflict over the right to handle an incoming call, which will cause the battery to run out and miss calls, and pick the most reliable solution and set it up correctly.
Frequent questions and problem-solving
Even with detailed instructions, users may have specific questions, often because the blocked subscriber still hears the beeps, or misstation notifications keep coming, which may be due to operator-specific work or Do Not Disturb settings.
Sometimes, after updating the system, the blacklist settings may get lost, in which case it is recommended to recheck the Security section and make sure that the lock switch is active. Android periodically changes the rules for app access to calls, which may require re-confirmation of rights.
If you have blocked a number but want to temporarily take a call from that person, the easiest way to do so is to temporarily remove it from the blacklist, and the alternative is to use Do Not Disturb mode with an exception for selected contacts, allowing you to ignore everyone but your loved ones.
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The integrated use of the built-in MIUI blacklist and the operator’s databases provides maximum protection against unwanted calls.
Remember that no method can guarantee 100%, especially against spoofing attacks, but the combination of methods described above allows you to cut off 99% of advertising noise and protect yourself from scammers.