Why is not blocked number on Xiaomi: full analysis

It is common for Xiaomi phones to continue to ring when they are called by a blacklisted subscriber, and users find that standard call filtering mechanisms simply ignore the established prohibitions, which is annoying, especially when scammers or intrusive advertising agents are concerned.

The problem is not hardware failure, but software conflicts of the MIUI shell or HyperOS. Often the system tries to delegate call management to third-party applications or Google contacts, which causes the built-in blocker to stop functioning correctly, and firmware updates that reset user security settings can also affect.

In this article, we will take a look at all the possible reasons why number locking doesn’t work, and suggest working solutions. You will learn how to set up your system blocker correctly, check application permissions, and what to do if standard methods don’t work. Understanding the architecture of Android calls will help you get rid of unwanted noise once and for all.

Conflict of contact sources and the phone application

One of the most common reasons why the lock doesn’t work is the confusion between Xiaomi’s Phone system app and Google Phone’s standard set. In recent firmware versions, the manufacturer often installs Google’s dialer by default, however, lock settings may remain in the native MIUI interface. As a result, you add a number to the blacklist of one app and handle calls with another.

To resolve this conflict, you need to check which app is responsible for making and receiving calls at the moment. If you have the Google Phone app installed, you need to look for lock settings in its menu, not in the Xiaomi system security application, and ignoring this fact leads to the fact that the subscriber continues to contact you.

You should also pay attention to the synchronization of contacts. SIM-card or account, but not correctly displayed in the local database of the phone book, the system may not recognize it as "forbidden.

To switch between apps or check current settings, go to Settings → Apps → All apps. Find an active dialer on the list and make sure it has the necessary rights. Often users accidentally turn off important permissions after a system update, which breaks the functionality of the blocker.

Mistakes in the MIUI blacklist settings

Xiaomi’s built-in security tool has a lot of functionality, but its settings can be confusing. If you add a number to the lock list but calls continue, maybe White List mode is activated or the filtering mechanism itself is turned off. The system can operate in a mode where only contacts from the phone book are allowed, ignoring the manual blacklist.

It is important to check whether the switch is in the position "Disable all locks." Sometimes after resetting or updating MIUI all filtering rules are reset to factory values, where the lock can be turned off, and it is also worth making sure that the number is entered correctly, without unnecessary symbols or country codes, if required by the format.

There's a nuance with hidden numbers, and if a caller hides their AON, the standard phone number blocker is powerless, so you need to activate the "Block Unknown Numbers" or "Block Hidden Numbers" option in the anti-spam settings, which is a radical but effective solution for those who suffer from persistent attacks.

⚠️ Note: When you enable locking of all unknown numbers, you may miss an important call from a courier, taxi or doctor if their number is not saved in your phone book.

It's recommended that you check the lock log periodically, and it shows all the attempts that have been rejected by the system, and if you see numbers that aren't on your blacklist, then the settings are not working correctly or you have activated an overly aggressive filter that needs to be reconfigured.

Problems with permissions and access to data

Android, beginning with version 10 and up, strictly controls apps’ access to personal data. The call app must have permission to read the phone book, call log and call management. If these permissions have been revoked by a user or security system, the lock function stops working.

Check the security and phone permissions, and they need full access to contacts and call management, without which the system blocker will not be able to verify the incoming number against the database of banned contacts in real time.

Special attention should be paid to the function "Autostart", if the security application is not authorized to autostart, it can be downloaded from RAM by the power saving system, at which point the incoming call will pass, since the blocker simply "sleeps."

It's also worth checking if the phone is worth it in Do Not Disturb (DND) mode, which has its own rules and can block calls selectively, ignoring blacklist settings, and make sure the modes don't conflict with each other.

The influence of third-party number determinants

Many users install popular number detectors, such as GetContact, NumBuster or Truecaller.These applications often require "over all windows" and call management to show the caller's name. By conflicting with the built-in blocker Xiaomi, they can intercept the call before the system blacklist works.

If the standard lock is no longer working after installing such software, the problem is that the call processing priority is the problem: the third-party application may not have its own blacklist or its settings may be shot down, and the call passes through the determinant filter and enters the phone.

The solution can be to disable the blocking function in the third-party application itself or completely abandon it in favor of built-in MIUI tools. Xiaomi’s built-in anti-spam works on the basis of local bases and often copes with regional spam more effectively without undue load on the system.

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Try removing the third-party number detector for a couple of days, and if the built-in lock works, it means that the conflict was in the software.

Also, some cleaners and antiviruses also have call protection modules. Having two or more active blockers on one device is a guaranteed way to get crashes. Leave only one active filtering tool.

Failures in operation SIM-card-and-operator

Sometimes the problem lies not in the plane of the smartphone, but on the side of the operator or the operator itself. SIM-The Blacklist service can be connected at the operator level but not synced to the phone, or vice versa. If you use the operator's locking services, the phone settings can be redundant and cause conflicts.

Check the balance and status of the additional services. Sometimes operators turn off the spam blocking service when they change their plan or the promo period ends, in which case the phone is technically sound, but the command to block is not executed by the network.

It is worth trying to extract. SIM-If the problem persists on another device, it's a SIM card or a tariff, and if the lock is working on the other phone, you should look for the reason in your Xiaomi settings.

⚠️ Note: Some operators offer number identifiers, which can interfere with blocking by labeling calls as “important” or “business”, which bypasses standard filters.

It is not superfluous to ask the operator to support you with the question whether there are any restrictions on your line, sometimes there are technical failures on the operator's databases, which are solved only by linking the service.

Radical methods: resetting and alternative applications

If none of these things worked, there may have been some bugs in the system that prevented telephony from working properly, and in this case, you could try resetting the phone and contact settings to the factory settings, which won't delete your numbers, but will return the standard settings.

To do this, go to Settings → Applications → All Apps → Phone → Memory → Clean. Select “Clean All” (contact data will not be affected if it is synced with the cloud, but it is better to back up).

In extreme cases, if the built-in MIUI functionality is not working properly, you can use third-party blocking applications that have deeper access rights or work differently. However, the most stable work on Xiaomi is shown by the native blocker in conjunction with the Google Phone application, if you configure their interaction correctly.

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Resetting the settings of the Phone application often solves the problem when a software failure prevents updating the database of locked numbers.

Remember that the outdated firmware version can also contain bugs. Check for system updates in the Settings menu → About the phone. Xiaomi engineers regularly release patches that fix network and call errors.

Frequently Asked Questions (FAQ)