Budget smartphone owners often face intrusive notifications that block calls from unknown numbers or, conversely, skip spam. MIUI anti-spam system can work incorrectly if settings have been changed or a software failure. For the Redmi 5A model, this problem is especially relevant due to limited memory resources, which are quickly filled with lock logs.
Understanding how call filtering works will help you manage incoming traffic effectively. Sometimes users confuse the system blocker with virus software that masquerades as useful software. Xiaomi implements its own security algorithms, but they require the right configuration for comfortable use.
In this article, we will discuss all possible ways to deactivate or fine-tune defense mechanisms, you will learn how to distinguish system functions from malware, and we will also look at methods to clean the device from advertising debris, which is often mistaken for standard anti-spam.
Reasons for Blocking and Advertising Windows
The main reason for the phone's aggressive behavior is pre-installed software, and MIUI firmware often activates recommendation services that show ads in system applications, which is not a virus, but a regular feature that can be turned off.
Another reason could be that third-party apps are installed from unreliable sources, and they get device administrator privileges and they start blocking calls or showing banners on top of other windows, and it's important to check the list of installed programs.
⚠️ Note: If the blocker appeared suddenly after installing a new game or utility, most likely the problem is in this application, not in the Redmi system. 5A.
It's also worth considering the human factor, because often users accidentally activate Do Not Disturb mode or install hard filters for incoming calls, forgetting about it after a while, and the automatic detector can mistakenly classify important numbers as spam.
Disabling the system blocker through the Security application
The built-in tool to combat unwanted calls is in the standard Security app. This is the green lightning icon that every Xiaomi device has, and this is where the basic filtering settings are concentrated.
First, you have to open the app and find the Antispam section, which is usually located at the bottom of the screen or in the toolbar, and you have statistics of blocked calls and messages.
☑️ Checking the Blocker settings
Inside the settings menu, you need to look at Lock, so you can turn the function off completely or you can set it up more flexibly, and if you want to remove the antispam, you need to put the switch in an inactive state.
Don’t forget to check the settings as well. SMS-Often spam filters work separately for text messages and may skip promotional mailings even when the call lock is off.
Removing malicious applications and cleaning up the system
If standard methods fail to fix the problem, it is possible that the system has settled advertising software, such programs are often hidden under the names of system processes or do not have an icon on the desktop. → Annexes.
Look for suspicious recordings without a title or with a stub icon. Deleting such objects often solves the problem with intrusive advertising. Redmi 5A is characterized by a lack of RAM, so any unnecessary processes greatly affect the work.
It is recommended to use the built-in virus scanner in the Security app. Run a deep system check. Although the built-in antivirus does not always find complex threats, it effectively identifies known advertising modules.
| Type of threat | Symptoms | Elimination method |
|---|---|---|
| Advertising virus | Pop-up windows on the desktop | Removal of last installed applications |
| Spam calls. | Blocking all unknown numbers | Setting up the rules in Antispam |
| Hidden miner | Strong heating and battery discharge | Full reset (Hard Reset) |