How to permanently block calls from unknown numbers on Xiaomi: 7 proven ways

Constant calls from unknown numbers are one of the most annoying issues for Xiaomi smartphone owners.Spammers, scammers and intrusive marketers can turn your phone into a source of stress by distracting from work or personal time, MIUI Offers several built-in tools to combat this, and additional apps extend the locking capabilities to the maximum.

In this article, we will discuss all the current ways to block unknown numbers on Xiaomi devices, from basic settings to advanced methods using third-party services. You will learn how to set up automatic filtering, create blacklists, use cloud spam databases and even block calls at the operator level. MIUI (12 to 14) and popular models - Redmi Note 12, POCO X5, Xiaomi 13 and others.

Importantly, some methods may differ depending on the regional firmware (global, Chinese, European).

1. Built-in locking of unknown numbers in MIUI

The easiest way to start fighting spam is to use built-in features. MIUI. Developers have added several layers of protection that work without installing additional applications.

To activate the basic lock:

1. Open the Phone app (the tube icon on the home screen).
2. Click on the three dots in the top right corner and select Settings.
3. Go to the section “Number Lock” (or “Spam and Block in New Versions”).
4. Activate the switch to Lock Unknown Numbers.

This feature automatically screens out calls from numbers that aren't in your phone book, but it has limitations.

• ⚠️ Does not block numbers that have previously called you (even if you have not answered).
• ⚠️ May skip spam from “fake” local numbers (e.g, +7 495 XXX-XX-XX).
• ⚠️ Doesn't work for SMS-spam (only for calls).

💡

If you stop receiving important calls (e.g. from couriers or banks) after activating the lock, add such numbers to the Exclusions in the same settings menu.

For more precise settings, go to Additional Lock Settings (available in the MIUI 13/14). Here we can:

• 📱 Enable number verification in the cloud spam database (requires connection to Mi Account).
• 🔍 Activate the definition of fraudulent numbers (works for Russia, India, China and other regions).
• 📵 Set up automatic blacklisting of spammers after the first call.

2. Blacklist: How to add a number manually

If automatic filters don't work, you can manually lock specific numbers, which is useful for intrusive collectors, fixed-number scammers, or former contacts you don't want to see in a log.

Instructions for adding to the blacklist:

1. Open the call log in the Phone app.
2. Find the number you want and click on it (the contact card will open).
3. In the upper right corner, click on three dots and select Add to the blacklist.
4. Confirm the action in the window that appears.

Alternative method (if the number is not in the journal):

1. Go to your phone settings → Spam and blocking → Blacklist.
2. Click Add a number and enter it manually (for example, +79123456789).
3. Specify the type of lock: Calls, SMS or both.

Features of the blacklist in MIUI:

• 🔄 Numbers are synced to your Mi Account (if sync is enabled).
• 🗑️ Blocked numbers do not appear in the call log (but are stored in the lock list).
• 📊 You can export/import a list via file (useful when changing phone).

3. Xiaomi's Cloud Spam Base: How to Connect and Configure

Xiaomi uses its own cloud-based spam numbers, which are updated in real time, which is available to users with a Mi Account attached and is based on reports from other users.

To activate cloud protection:

1. Open the Settings. → Spam and blocking.
2. Turn on Spam Detection (or Cloud Spam Detection in global firmware) switch.
3. Click on Spam Detection Settings and select:

The advantages of a cloud base:

⚠️ Note: A cloud database may mistakenly block legitimate numbers (e.g., from delivery services or banks). 1-2 For weeks and add the numbers to the white list.

4. Third-party applications to block spam

If the built-in tools MIUI Not enough, you can install specialized applications. They offer advanced functions: analysis. SMS, Keyword blocking, integration with global spam databases.

Top.-3 apps:

• 🛡️ Truecaller is the most popular spam number database with over 300 million users, recognizes scammers by name, shows reviews of the number.
• 🔒 Hiya is a lightweight application with a minimalist interface, and it's good at blocking robbrae and SMS-Spam, supports the Russian-language base.
• 📵 Kaspersky Who Calls is a security-focused Kaspersky Lab solution that checks real-time fraud numbers.

How to set up Truecaller on Xiaomi:

After installing any of these applications:

1. Open the application settings.
2. Turn on Automatic Lock.
3. Set up filtering levels (e.g., block all unnamed numbers in Truecaller).
4. Add important numbers to the Exclusions so you don’t miss important calls.

⚠️ Note: Some applications (such as Truecaller) may conflict with the built-in lock MIUI. If calls are no longer blocked, disable one of the systems in the settings.

5. Locking at the operator level

Many mobile operators offer their own spam blocking services, which are network-based and can be more effective than software filters.

Blocking services from popular operators:

Advantages of operator lock:

• 📡 It works even if the phone is turned off or in flight mode (filtering is at the network level).
• 🔄 Updated automatically without your participation.
• 📵 Locks it down. SMS-Spam (unlike many other applications).

Disadvantages:

• ❌ Not all operators support the blocking of international numbers.
• ❌ May delay legitimate calls (e.g. from virtual bank numbers).
• ❌ Requires proof of identity (sometimes you need to visit the operator's office).

💡

Operator lock is the only way to stop spam on the Internet SIM-If you use a card without a phone MIUI (For example, on an iPhone or other Android).

6. Hidden MIUI features for power users

For those who are ready to dive into deep settings MIUI, There are several hidden features that enhance spam protection.

Method 1: Blocking by prefix of the number

If you are being flooded with calls from certain codes (for example, +375 for Belarus or +380 for Ukraine, you can block whole ranges:

1. Open the Settings. → Spam and blocking → Lockdown rules.
2. Select Add a rule.
3. In the Prefix field, enter the country/region code (e.g, +375).
4. Enter Action: Block all calls or Block and delete from the log.

Method 2: Using ADB for deep customization

For advanced users, it is possible to disable calls from unknown numbers at the system level through the ADB. This is useful if standard methods don’t work due to custom firmware.

adb shell settings put global block_unknown_callers 1

To get it back:

adb shell settings put global block_unknown_callers 0

⚠️ Attention: Misuse of the right ADB It can cause a phone to malfunction. MIUI 14 with the latest security updates (patch from March 2026 and later).

Method 3: Configure through the Engineering Menu

In some Xiaomi firmware, you can activate hidden locking functions through the engineering menu.

1. In the phone application, type the combination ##4636##.
2. Go to the Phone Information section.
3. Scroll down and find the Unknown caller block option.
4. Turn it on and restart the phone.

7 What to do if spam continues

If after all the settings, calls from unknown numbers continue to bother you, try the following steps:

Step 1: Check the synchronization settings

Sometimes the lock doesn't work because of a conflict with cloud services. → Accounts. → Mi Account → Synchronize and make sure that:

• 🔄 Synchronization of Contacts and Call Logs is enabled.
• 📵 Spam Number Synchronization is disabled if you use third-party apps.

Step 2: Reset the settings of the Phone application

If the lock is not working properly, reset the settings:

1. Go to Settings → Applications → Application Management.
2. Find the phone and open its settings.
3. Press Warehouse. → Delete data (this won’t delete contacts, only settings).
4. Restart the phone and set up the lock again.

Step 3: Update MIUI last-minute

In the new versions MIUI 14 improved spam recognition system. Check for updates:

1. Open Settings → About the phone → System update.
2. If an update is available, install it.
3. After the update, restart the phone and check the lock.

Step 4: Contact Xiaomi Support

If the problem is not resolved, contact official support:

• 🌍 Through the site: mi.com/support.
• 📧 By mail: support@xiaomi.com (Please indicate the phone model and version MIUI).
• 📞 On the phone: +7 495 644-05-50 (for Russia).

💡

If spam calls are coming from the same number despite being blocked, this could be a sign of a problem. SIM-Spoofing (number swapping) In this case, only a replacement will help. SIM-card or call to operator.

FAQ: Frequent questions about blocking calls on Xiaomi