Intrusive calls from indefinite numbers are a problem for almost every smartphone owner, and users of the Xiaomi ecosystem are no exception. Constant interruptions to conversations or workflow are annoying, and in some cases can pose a real threat to the security of your data. Modern versions of the MIUI shell and HyperOS offer powerful built-in tools for filtering traffic that often remain underrated.
In this article, we will take a look at all the available methods, from standard system settings to advanced engineer codes. Locking down unknown subscribers is not just a matter of comfort, but a necessary measure of digital hygiene. You will learn to set up smart filters that will skip only important calls, sifting out advertising noise.
Many users mistakenly believe that paid applications are essential for quality protection, but Xiaomi’s built-in Security functionality works at the system level, consuming minimal resources and delivering high efficiency. Let’s look at how to activate these capabilities right now.
Built-in locking functions in MIUI and HyperOS
The main protection tool in Xiaomi smartphones is the system application “Security”, and this is where all the necessary levers for controlling incoming traffic are concentrated. To get started, you need to open this application, which usually has a green icon with a shield, and find the “Block” section.
Inside the lock menu, you can choose how the system will respond to calls from numbers that aren't in your notebook, and the standard behavior is to reset the call, but you can set up a busy signal or forward if you want.
Special attention should be paid to the Antispam feature, which is often updated through cloud databases, which can (recognize) not only hidden numbers, but also well-known telemarketing centers, activating this option significantly reduces the amount of advertising debris.
- 🛡️ Blacklist: allows you to manually add specific numbers or entire prefixes for complete isolation.
- 📵 Do Not Disturb: Automatically rejects all calls except those marked as favorite contacts.
- 🔒 Blocking hidden: a separate switchboard for cutting off calls, where the number determinant is disabled by the caller himself.
It is important to note that the interface may vary slightly depending on the Android version and regional firmware (Global, CN, EEA). However, the logic remains the same: the control center is located in the security application. Don't ignore the regular updates to the spam databases that come along with the Security app update.
Step-by-step setting up the blacklist
To completely disable unknown calls, it is not enough to simply turn on a common filter. It is recommended to create a personalized blacklist. Go to lock settings and select "Blacklist" here you will see a list of already blocked numbers and add new ones.
The system offers multiple lock scenarios: you can lock a specific number, all numbers with a specific city code, or even all unknown numbers at once, the latter being the most radical, but effective option for those who only wait for calls from saved contacts.
☑️ Set up the perfect protection
When you add a number manually, the system can request confirmation of the action, and then all attempts to communicate from this source will be interrupted at the network level of the operator or the device itself, without making sound or vibrating, which allows you to remain calm even in noisy places.
⚠️ Warning: By including a complete lock on all unknown numbers, you risk missing an important call from a courier, doctor or delivery service whose number you do not already have in your contacts.
You can also set up a schedule in this section, so you can make hard filtration work only at night or on weekends, and it's a flexible approach that combines security and accessibility.
Using engineering codes to hide numbers
There is a deeper level of customization available through special USSD-These commands allow you to manage the forwarding and status of the number at the level. SIM-One of the most effective methods is to activate the forwarding of all unknown calls to voicemail or to a non-existent number.
You can use the code ##002# to reset all redirects or *#31# to check the status of the number, but it often requires a combination of actions through the phone menu to block those from hidden ones.
Dial #4636# to enter the test menu (not working on all firmware)You can find the phone test menu, phone information or call settings, and sometimes you can hide options that are not available in the normal interface, for example, you can force the network type to be set or check the registration status of the network, which indirectly affects filtering.
- 📞 *67#: Standard code to hide your number when you call (useful to check).
- 🚫 *77#: In some regions, activates the service "Anonymous call" from the operator, blocking incoming from hidden.
- 🔄 ##002#: Cancels all types of redirects, returning settings to factory settings.
What do I do if the codes don't work?
Using codes requires care. Incorrectly entered commands can change the settings of correspondence or voice. Always check the code by making a test call from another device.
Third-party applications for advanced filtering
If MIUI is not enough, the market offers powerful alternatives: apps like Call Blocker, Truecaller, or GetContact use crowdsourcing to identify spam, and they label the caller as “Adverts,” “Collectors,” or “Crackers” before you even pick up the phone.
Installing such applications requires broad permissions to access contacts and call logs, which is essential for their proper operation, but raises questions for those concerned about data privacy. (weighing the risks), many users choose the middle ground using only the number-detection function without synchronizing the entire phone book.
For Xiaomi users, it is important to properly configure autoruns and permissions for such applications, otherwise the system can “kill” the filtering process in the background. Go to the application settings and allow work in the background, as well as autorun.
| Annex | Room database | Paid version | Impact on the battery |
|---|---|---|---|
| Truecaller | Global, huge. | Got it (Premium) | Average. |
| GetContact | Social (tags) | Got it (Gold) | High. |
| Call Blocker | Local + Cloud | Got (Pro) | Low. |
| Yandex (with a determinant) | RF and CIS | Paid subscription | Average. |
When choosing a third-party solution, pay attention to reviews and privacy policies. Some applications may be too aggressive in collecting data, which is contrary to the security purpose.
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Tip: If you use a third-party number detector, be sure to turn off the MIUI-built detector to avoid conflicts and double notifications on the lock screen.
Blocking at the operator level
The most reliable way, independent of battery power or smartphone settings, is through the operator himself, and the Big Four (MTS, Beeline, MegaFon, Tele2) and virtual operators offer services like Antispam or Blacklist, which run in the operator's cloud, cutting off debris before the signal reaches your SIM card.
The connection of such services is usually paid (monthly subscription) or free with limited functionality. USSD-This solution is ideal for those who want to get rid of the robot calls, which often change numbers.
The advantage of network locking is that it is effective even when the phone is off or out of range (calls will not be logged in). However, the operator cannot always identify a new spam number instantly, so the databases take time to update.
⚠️ Attention: Operator-level lock service may be charged. carefully review your provider's rates before connecting to avoid unexpected charge-offs.
Often, operators offer a 14 or 30 day trial period, which is a great opportunity to test the effectiveness of filtering in your area before purchasing the full version of the service.
Frequent Problems (Frequent Problems) and FAQ
Even when set up correctly, there may be nuances, such as locking settings being reset to factory settings after updating the firmware, or an important call from the bank may be mistaken for spam, in which case you need to manually check the lock log in the Security app.
If you have changed region in your phone settings (e.g. from Russia to India or China), the lock menu may change or disappear altogether, in which case it is recommended to change region back or use third-party apps to unify the experience.
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Regularly checking the lock log is the only way to make sure the system hasn't cut off important calls from delivery services or clinics.
Remember, no system gives 100% guarantee, a combination of methods (phone settings + operator services + common sense) gives the best result. Do not answer suspicious calls, even if they were not automatically blocked.