Modern Xiaomi smartphones provide users with ample opportunities to manage incoming traffic, but the problem of intrusive calls from unknown or hidden numbers remains relevant. Fraudsters and unscrupulous marketers often use the function of hiding their ID (CLI) to avoid blocking and increase the likelihood that a subscriber will pick up the phone. For owners of devices based on MIUI and HyperOS, this creates a need to understand the intricacies of configuring call filtering.
Effective protection against anonymous calls requires a comprehensive approach, as a single “magic button” in the global settings of the system may not be. Locking hidden numbers often depends on the combination of the capabilities of the phone itself and the services provided by the mobile operator. owners of Redmi and POCO must understand the architecture of the call to properly configure the cutting off of unwanted traffic.
In this article, we will discuss in detail all available methods, starting from built-in functions. MIUI and ending with specialized USSD-You'll learn to distinguish between system constraints and network capabilities, which will allow you to create a robust barrier to invisible subscribers.
Principles of operation of hidden numbers in GSM and LTE networks
To effectively combat the problem, you need to understand the technical nature of the problem: a hidden number is not a magical property of the caller’s phone, but a standard feature of the telecommunications network, known as CLIR (Calling Line Identification Restriction), where when a subscriber hides his number, his device sends a special signal to the network asking him not to transmit the caller’s ID to the receiving party.
Xiaomi smartphones, when they get this call, see an empty value in the number field or a special marker "Hidden Number." The standard logic of the Android mobile operating system suggests that if the number is not defined, it can not be added to the blacklist by numerical value, since there is no value itself, and this is the main difficulty for users who are used to simple blocking contacts.
⚠️ Note: Complete technical locking at the smartphone level is not possible on all versions of the firmware. MIUI They may behave differently than the Chinese (CN ROM), Differences in Google Certification and Local Security Requirements.
Caller ID is at the network alarm level, and the phone only displays what the base station is transmitting to it. If the operator has given information that the number is hidden, the phone must display it accordingly. Anonymous calls are often used to bypass spam databases, since they cannot be blocked preventively by a mask of the number.
Use of built-in locking functions in MIUI
The MIUI shell and the new HyperOS have a powerful built-in security module that is based on the Avast or Tencent antivirus engine (depending on the region), which can filter incoming ones, but its ability to work with hidden numbers is limited by Android logic.
To access the settings, you need to open the Phone app and go to the settings menu. We're interested in Settings → Lock → Blacklist. Here you can see the Block Unknown Numbers option, but it often only blocks numbers that are not in your phone book, not necessarily hidden technically. However, activating this feature is an important first step.
Some firmware versions, especially Chinese ones, have a more aggressive filter. If you use the global version, you may need to activate advanced settings through the developer menu or use the ##4636## code to access hidden test menus, although there is usually no direct CLIR lock, with the emphasis on intelligent analysis of incoming traffic.
☑️ Checking settings MIUI
It is important to understand that Xiaomi’s built-in tools are primarily focused on combating known spam databases, not technically cutting off anonymous users. If your phone does not have a direct “Block Hidden” option, this is not a defect, but a feature of implementing communication standards in your region.
Blocking through codes and services of mobile operators
The most efficient way, which works regardless of the smartphone model, whether it’s the Redmi Note 12 or the flagship Xiaomi 14, is by the carrier itself.The network takes precedence over the above device and can reject the call even before it arrives on your phone.It’s the only method to ensure that the hidden number doesn’t even make your device vibrate.
The largest operators (the “big four” in Russia and analogues in the CIS) provide paid or free services for blocking anonymous calls. USSD-For example, for some operators, it could be code like *110*77# or activation via a personal application, the exact code should be checked with your ISP, as they often change.
- 📞 MegaFon: Service "Number Antideterminator" (often paid) or setting through the application "MegaFon".
- 🔴 MTS: Service "Black List" with the option to block hidden numbers, activated through the personal account.
- 💙 Beeline: Service "Prohibition of calls" or analogue available in the section settings tariff.
- 🟢 Tele2: Blacklist option to add rule for anonymous callers.
The advantage of the network method is that it does not load your Xiaomi processor and works even when the phone is turned off or out of coverage (you will see missed from known numbers, but not from hidden ones). ID.
What if the code doesn't work?
Application of third-party applications for filtering
When MIUI is not enough, Google Play applications come to the rescue, and they work by "overlapping" a standard call or using access rights to analyze an incoming call and reset it if the number is not determined, and this requires careful permission setting.
One of the most popular solutions is the Calls Blacklist app, which allows you to create rules like "Block all hidden numbers." Once installed, you need to give the app the rights to read the call log and manage calls. In the program settings, you should activate the option to block numbers that are not displayed (No Caller ID).
Another powerful tool is Truecaller, which has a huge spam number database. Although its primary function is to identify a number, it also knows how to block hidden calls if allowed in lock settings. However, it's worth remembering that such apps require access to your contacts and calls, which is a matter of personal digital hygiene.
| Annex | Type of lockdown | Payment | Impact on the battery |
|---|---|---|---|
| Calls Blacklist | Rules/Masks | Freemium | Low. |
| Truecaller | Database + Hidden | Freemium | Average. |
| Should I Answer? | Community feedback | Free of charge. | Low. |
| Getcontact | Tags and database | Freemium | Average. |
When using third-party software on Xiaomi, it is critical to properly configure boot and background work, otherwise the system will “kill” the filtration process to save energy. Go to Settings → Applications → All Apps → [Your Blocker App] and turn on “Sunset” and “No Limits” mode in “Battery Savings”.
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Do not install two active blockers at the same time. This can cause a conflict of Android resources, which will stop calling at all or the application will constantly fly out.
Setting up the "Do Not Disturb" mode as an alternative
If you don't want to install additional software and you pay for the operator, you can use the built-in Do Not Disturb (DND) mode, which is not a complete lockdown, but an effective way to ignore it, and the essence of the method is to allow calls only from selected contacts, and everyone else, including hidden ones, will deviate or simply not wake the screen.
To set up, go to Settings → Sound and Vibration → Do Not Disturb. Under Calls, select "Favorites Only" or "Contacts Only." In this case, when you get a call from a person with a hidden number, the phone will not sound or vibrate, and the call will be missed (or reset, depending on the Android version), but you can see the fact of the call in the log later.
The good thing about this method is that it's native to HyperOS and doesn't require any third-party interventions. You can always turn it on quickly through the notification curtain if you expect silence, but you want to stay in touch with your loved ones. It's a flexible attention management tool.
Technical nuances and limitations of Android
It is important for Xiaomi users to realize that Android has strict API (app programming interface) limits. Since Android 7 and up, Google has limited the ability of apps to directly manage call rejection without superuser (Root) rights. That is why many old methods have stopped working, and applications now use accessibility services or reset emulation.
On Root-enabled devices (received through Magisk), the situation is changing dramatically, with modules and scripts that can be embedded in the telephony system process and reject CLIR-flagged calls at the lowest level. However, obtaining Root-rights on modern Xiaomi is difficult, requires unlocking the bootloader, and can lead to the loss of warranty and inoperability of banking applications.
Also worth mentioning is VoLTE and VoWiFi. LTE Wi-Fi alarms are different than in the classic GSM-Some operators may not transmit the hidden number flag correctly in the data packet. IMS, and the phone can display a call like "Unknown" or just a blank line, making it difficult to filter software methods.
⚠️ Warning: Don't try to get Root rights just for the sake of blocking calls unless you're an experienced user.Unlocking a bootloader on Xiaomi requires waiting 7 days (sometimes longer) and a mandatory data backup, as the process resets the phone to factory settings.