Xiaomi: Why does Antispam turn on itself and how to fix it?

Owners of smartphones Xiaomi, Redmi and POCO Often faced with mysterious behavior of the system, when the function of blocking unwanted calls is activated without the user's knowledge. the situation when anti-spam on Xiaomi turns on on itself can be annoying, especially if you expect an important call from a courier or employer, and the phone is silent. It’s not always a bug, sometimes it’s designed by shell developers. MIUI HyperOS to protect against fraudsters.

However, spontaneous activation can also indicate a software failure, conflicting applications or incorrect security updates. In this article, we will analyze the causes of this behavior, analyze system logs and propose a step-by-step algorithm for actions.

Before you go to radical measures like a full reset, it's worth checking the basic settings and permissions. Often the problem is that security gets priority over user preferences after another update. Understanding the architecture of the Security App will help you take control of the device into your own hands.

System logic of the Security App on MIUI and HyperOS

The Security app on Xiaomi smartphones is not just an antivirus, it's a deep system module integrated into the shell core, and it's responsible for traffic filtering, app checking, and call blocking. When you notice that antispam is turned on itself, it's often the result of machine learning algorithms embedded in the system. The number database is constantly updated through the cloud, and if your number or caller number is placed on suspicious lists, the protection can be forced to activate.

There are also hidden scenarios that run under certain conditions, such as if you are roaming or connected to a public Wi-Fi network, the level of protection can be increased automatically. MIUI aims to create a bulletproof environment, sometimes ignoring the user's manual settings for security, which is especially true in regions with high levels of telephone fraud.

It's important to understand that the security app has the highest privileges on Android, that it can overwrite its configuration files every time it runs if it finds a discrepancy with server rules, which is why manually shutting down the feature can be a temporary solution if it doesn't turn off cloud sync.

⚠️ Warning: Forced shutdown of security system services through ADB It can cause unstable phone operation and system errors. UI». Act carefully.

The main causes of spontaneous activation

There are several key factors why filter settings can change without you being involved. The first and most common reason is to update malicious number databases. When antispam receives a fresh signature packet, it can recheck all current settings and apply stricter filtering rules. This is a routine behavior, but it is often perceived by the user as an error.

The second reason is often third-party applications that request access to calls and contacts: messengers, number detectors (like GetContact or NumBuster), and even some banking applications can conflict with the system module Xiaomi. If a third-party application gets priority processing incoming calls, it can broadcast a command to enable the lock in the system log, which the Security App immediately executes.

The third reason is the firmware version bugs, and some MIUI builds have encountered errors where resetting network settings or changing region has led to a return of security settings to default values, where anti-spam is often enabled, and the impact of viruses or adware that may disguise themselves as system processes should also be considered.

• 📲 Updating cloud databases of malicious numbers and spam lists.
• ⚔️ Priority conflict between system application and third-party number determiners.
• 🔄 Failure to update firmware or return to factory settings of the security module.
• 🦠 Presence of malware that mimics system processes.

Step-by-step: how to prohibit auto-inclusion

To solve the problem, you need to do a complex setup. Start by checking the main lock menu. Go to the Security app, then select Antispam. Click on the gear icon in the upper right corner. Here you need to make sure that the Antispam switch is off, but the main thing is to check the "Update Base Automatically" item. If it is active, the system will constantly try to return the settings to current.

Next, you need to limit the rights of the security application itself to change system settings if the Android version allows. Go to Settings → Apps → All apps → Find Security (or Security). Select Other permissions. Here, you should disable the ability to change system settings if such option is available in your version of the HyperOS shell.

It is also important to check the "Do Not Disturb" settings. Often users confuse these features. Antispam may be turned off, but the "Do Not Disturb" mode is turned on on on schedule or geolocation, creating the illusion of a blocker. Make sure that in the "Settings" section → Sound and vibration → Do Not Disturb no active automatic rules.

After you have done all the manipulations, make sure to reboot the device completely, which will clear the cache of telephony services and force the system to reread the configuration files with your new parameters, and if the situation repeats after a few hours, then the locking process is initiated at the carrier level or through a hidden system service.

Working with permissions and third-party applications

Application conflicts are one of the hardest problems to diagnose, and if you have any third-party numbering software installed, it can take control, and even if you're not actively using it, the background process can dictate how it works, and try to temporarily remove all of these apps and monitor how your smartphone behaves throughout the day.

Special attention should be paid to permissions for instant messengers. Viber, WhatsApp and Telegram can request access to the call list for integration with the phone book. In rare cases, incorrect implementation of this access in older versions of applications could cause malfunctions in the Xiaomi phone module. Update all applications through Google Play or GetApps.

There is also the possibility that malware has entered the system with administrator privileges. Check the list of devices with administrator permissions in the Settings menu → Passwords and security → Device administrators. If there are unknown programs there, immediately revoke their rights and delete them. This is a critical step for the security of your data.

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Use Safe Mode for diagnosis, and if it doesn't turn on the Antispam itself, it's a third-party application that's causing the problem.

Resetting the application settings Security

If simple methods don’t work, a deeper intervention is needed — a data reset of the Security app itself — that won’t delete your personal files, photos, or contacts, but will bring all antivirus and anti-spam settings back to factory settings, often helping to “cure” the frozen configuration files that trigger spontaneous activation.

To perform the reset, go to Settings → Apps → All apps. Find Security (shield icon) in the list. Press Memory or Storage, and then select Clear → All data. After that, the phone can warn you about resetting network settings - confirm the action. You will have to reconfigure Wi-Fi passwords and lock preferences.

After reset, take your time to set up complex rules immediately. Watch the device in a clean state. If the problem was a software bug, it should disappear. If the anti-spam turns on itself after a while without your actions, this may indicate a more serious problem with the firmware or Mi Account.

⚠️ Note: Once the data is reset, the previously downloaded offline virus databases may be deleted, and it is recommended to connect to Wi-Fi to update them when you first start.

Impact of system and Mi Account updates

Xiaomi’s ecosystem tightly links to Mi Account. Security settings are often synced through the cloud. If your other device (tablet or old phone) has hard anti-spam enabled, when you log in to a new device, settings can pull up from there. Check cloud sync in Settings → Mi Account → Cloud.

System Updates (OTA) is another trigger: Once a new version of MIUI or HyperOS is installed, the security system may review its rules. Developers often strengthen the security in new versions to comply with Google Play Protect or local legislation.

Sometimes the problem is regional, if you buy a phone that's designed for the Chinese market (CN Version) and reflash it to a global version, or vice versa, there may be conflict in the way system services work. The Chinese version of the shell filters traffic and calls more aggressively, believing the user is less experienced.

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Syncing through Mi Cloud can return remote settings. Check all your devices in the Xiaomi ecosystem.

Diagnostics through the Engineering Menu and ADB

For advanced users who want to get to the bottom of the problem, debugging tools are available. You can send a command through the computer to turn off certain components of telephony that are responsible for intrusive filtering. USB» menu "For developers».

If you connect your phone to your PC, you can use ADB (Android Debug Bridge), and the command to reset the phone app settings is as follows. Be careful when you type in, one error can cause calls to fail.

adb shell pm clear com.android.phone


adb shell pm clear com.miui.securitycenter

These commands will clear the cache and data of the telephony system modules and the security center, and then the phone will restart, which is a nuclear method that helps in 90% of software failures, where the interface does not change the settings or they are reset instantly.

⚠️ Attention: Use ADB Incorrect removal of system packets can lead to "brickling" of the phone or loss of signal.

Frequently Asked Questions (FAQ)