Why Xiaomi’s Blacklist Doesn’t Work: All the Reasons and Solutions

You’ve added a number to your Xiaomi blacklist, but calls and SMS from unwanted subscribers keep coming?The problem is found on Redmi Note 12, POCO X5, Mi 11 and others — regardless of the version of MIUI. 80% of cases are not due to firmware bugs, but to incorrect settings or application conflict. In this article, we will analyze all the possible causes of a broken blacklist on Xiaomi in 2026, including hidden system restrictions that are not written in the official documentation.

First, check the basics: the number is exactly added to the blacklist (not to the list of contacts marked "spam"), and the list itself is not disabled in the settings. If all is correct, but the lock does not work, read on. We have compiled solutions for all versions. MIUI (including HyperOS, as well as individual instructions for dual models SIM-I'm talking about the cards and the firmware — FAQ answering frequent questions and the compatibility table of locking functions by model.

1.The blacklist is disabled in the security settings

The most common reason is that the user accidentally deactivated the lock function. In MIUI, the blacklist is managed through the Security menu, not the standard Phone app.

1. Open Settings → Security → Blacklist.
2. Make sure the switch in the upper right corner is on (the slider must be blue).
3. Check that the number is added to the list (click on it – the tick should burn).

If there is no switch at all, your version MIUI uses an alternative method of blocking (see section 3). POCO Redmi blacklist is hidden behind additional settings:

Settings → Applications → Application Management → Phone → Permissions → Call Blocking

⚠️ Note: On HyperOS phones (such as Xiaomi 14), the path to blacklisting has changed. → Privacy → Lockdown and protection → Blacklist.

2. Conflict with Spam Blocking Apps

If you install third-party applications like Truecaller, GetContact or Hiya, they can intercept lock control, and MIUI doesn't see the number on the blacklist because it's handled by other software.

• 📱 Disable permissions for third-party blockers: Settings → Annexes → Application management → [name] → Permits → Deactivate "Call lock".
• 🔄 Reset the settings of the phone app: Settings → Annexes → Phone. → Warehouse → Clear the data (Warning: call histories will be deleted!).
• 🚫 Remove conflicting programs if you don’t use their functions.

Especially often, the problem with Truecaller is that this app creates its own blacklist that doesn't sync with the system.

1. Open Truecaller.
2. Go to Settings → Block → Blacklist.
3. Remove the number from there or disable the lock in the application.

3. Limitations of the telecom operator

Some mobile operators (such as Tele2 or Iota) block blacklist system functions at the level of the mobile network. SIM-It's connected to their own spam protection services:

• 📶 Change it. SIM-card to another (for example, MTS or Beeline) and check the blacklist.
• 📞 Call the operator and check if the service is activated "Spam Protection" (sometimes it conflicts with the system lock).
• 🌐 Check the settings. APN: Settings → SIM-maps and mobile networks → [yours SIM] → Access points (APN). Make sure that a standard operator profile is used.

If the problem disappears when you change your SIM, please contact the operator to disable their locking service. Alternatively, use double lock:

1. Add the number to the MIUI blacklist.


2. activate the lock of this number through the operator's personal account.

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On two phones. SIM-The blacklist can only work for the main SIM. To block the numbers on the second SIM, Add them to the blacklist through the call menu of this one. SIM (Click on three dots in the "Phone" app" → "Call settings").

4. Failure of system services or cache

If the blacklist stopped working after updating MIUI or installing a new application, the system services failed.

• 🔄 Clearing the cache of the "Phone" application":

Settings → Applications → Application Management → Phone → Storage → Clear cache

• 🛠️ Reset network settings (does not delete data, but resets call settings):

→ SIM-maps and mobile networks → Network reset

• 📱 Restart in Safe Mode (checks if third-party software interferes with the system):

Press the power button → hold off “Switch off” → press “OK” to go to safe mode. This mode only works system applications. If the blacklist is working, delete the recently installed programs.

⚠️ Note: On HyperOS phones (e.g. Xiaomi) 13T) Resetting the network settings may temporarily shut down the mobile Internet.

The phone app cache has been cleared.

Checked the blacklist in safe mode

Backup of contacts and call history

Disabled. VPN and proxy (if used)-->

5. Firmware errors or regional restrictions

On some Xiaomi models (especially Redmi for the Chinese market), the blacklist does not work properly due to regional restrictions, for example, on firmware for India or China, the lock function can be reduced.

1. Open the settings → About the phone → version of MIUI.
2. If the firmware name at the end is CN (China), IN (India) or RU (Russia), but you use the phone in another region, this could be the reason.
3. Update your firmware to the global version (Global) through Settings → System Update.

Blocking errors are also found in MIUI betas. If you participate in a testing program, roll back to stable firmware:

Settings → About Phone → MIUI → Press 10 times on “Kernel Version” → Select a stable update channel

6. Hardware limitations or damage to the communication module

If none of these methods worked, the problem could be the hardware of the phone, and it's rare, but there are cases where the IMEI module or the antenna unit responsible for handling calls is damaged.

• 📵 The blacklist doesn’t work for just one person. SIM-The second block is normally blocked).
• 🔌 The phone periodically loses the network or does not catch a signal in places with good coverage.
• 📱 After the reboot. IMEI Reset to standard (000000000000000000000000000000).

To diagnose:

1. Check the IMEI with the code *#06#. If it is missing or incorrect, you need a repair.
2. Install the Network Signal Guru app and check the signal stability.
3. If the phone is warranty – contact the Xiaomi service center with a request to check the communication module.

⚠️ Warning: Don’t try to restore IMEI using the engineering menu (#4636##) - this can lead to total loss of the network.

7. Alternative ways to block numbers

If the standard MIUI blacklist doesn’t work, use alternative methods:

• 📱 Blocking through the operator: most operators (MTS, Beeline, MegaFon) allow you to block numbers through your personal account or USSD-For example, send a team to MTS. SMS with the text of the BLOC [number] on 111.
• 🔒 Blocking apps: Call Blocker or Blacklist (only download from Google Play to avoid viruses) create their own blacklist, independent of the system.
• 📞 Call forwarding: Configure forwarding of unwanted numbers to a non-existent number (such as 000). To do this, dial *#21# and follow the instructions.

For models with HyperOS (such as Xiaomi 14), there is a hidden lock function via Google Messages:

1. Install Google Messages from the Play Market.
2. Open a chat room with an unwanted number.
3. Click on three dots → “Details” → “Block and report spam.”

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If the MIUI blacklist doesn't work, first check your security settings and conflicts with apps. Only 5% of cases are due to a hardware malfunction or firmware failure.

FAQ: Frequent questions about the blacklist on Xiaomi