Many Xiaomi, Redmi and POCO smartphone owners have experienced a sudden, loud sound that is not confused with anything: the screen lights up and the speaker emits a piercing alarm warning of imminent danger. This is the Emergency Alert System, which is built into the MIUI and HyperOS operating system by default. It is not a third-party application that can be simply removed, because it serves as a tool for civil protection.
It's based on geolocation and local emergency services. If you're in an area where you're alerted for a natural disaster, a man-made accident or a military threat, your phone will receive a special data package. Android handles that signal with the highest priority, ignoring the "Do Not Disturb" mode or silent profile. Understanding this mechanism is critical for each user to distinguish system failures from real threats.
In this article, we will discuss in detail why emergency notifications can come false, how to set them correctly, and whether it is possible to turn off annoying sounds without losing access to vital information.
The operation of the Cell Broadcast system
The technology behind these notifications is called Cell Broadcast. Unlike traditional SMS, which is sent to a specific phone number, Cell Broadcast is broadcast to all devices connected to certain cell towers within a given geographic radius, which provides instantaneous information even in conditions of network congestion, when normal calls and messages may not pass.
When a carrier receives a command from the Emergencies Ministry or similar service, it sends a signal to base stations. Your Xiaomi smartphone, which is in the coverage area, receives this packet. It is important to understand that this function does not require an active Internet connection (Wi-Fi or mobile traffic), just registering with the cellular operator's network, the signal is processed at the modem level, which guarantees its delivery even when the screen is locked.
⚠️ Note: System alerts are of the highest priority. They can play sound even if the phone is in silent or air mode (if the flight mode was switched on software rather than hardware, although in deep air mode the signal reception is physically impossible, but when the network first appears, the alarm may come).
The protocol categorizes messages by severity, there are test mailings, weather alerts and reports of imminent threat to life. Xiaomi, as a manufacturer, adjusts the software part to meet the requirements of the laws of the countries where the device is sold, which is why the set of available notification categories may differ in different regions.
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Check to see if your smartphone is upgraded to the latest version of MIUI. New firmware versions have improved false positive filtering and added support for new categories of emergency messages.
The main types of emergency notifications
The system classifies incoming signals, allowing the user to flexibly manage the flow of information. On Redmi and POCO smartphones, three basic alarm levels are usually available. The first level is Extreme. These are reports of an imminent threat to life, such as a tornado, tsunami or missile attack, and it is legally forbidden or extremely difficult to turn off this type of notification in most countries.
The second type is Severe, which is a warning for severe storms, floods or major fires that may require evacuation or preparation, and the third type is AMBER Alert, a specific feature used primarily in the United States and some European countries to search for missing children, and it sends out a description of the vehicle and the suspect's appearance.
- 🌪️ Natural disasters: earthquakes, hurricanes, tsunamis, forest fires.
- ☢️ Man-made disasters: radiation threat, chemical accident, dam break.
- 🚨 Threats to security: terrorist threat, martial law, search for dangerous criminals.
The user can choose which categories they want to see, but remember that ignoring the warnings of natural disasters can put you in a dangerous position, and it is recommended to leave at least notifications of catastrophic events on, even if they seem rare.
Where to find alert settings in MIUI and HyperOS
These features are managed on Xiaomi devices not through a separate application, but through the system settings menu. The path to them may vary slightly depending on the shell version, but the logic remains the same. To get to the desired section, you need to open Settings and go to Security and Emergency. In some versions of MIUI, this section may be called simply Security or be inside the Passwords and Security menu.
Inside this menu, you'll find Wireless Emergency Warnings, which is where all the switches are located, and the interface can be hidden if the SIM card is not inserted, or if the region of the device is installed in a country where the function is not supported by operators, in which case the menu can be empty or hidden.
To access advanced settings, you sometimes need to click on three dots in the upper right corner or select optional. Here you can see technical details such as the broadcast channel ID. The average user is not advised to change these settings unless absolutely necessary, as this can lead to malfunctioning of the communication module.
☑️ Checking security settings
Why False Anxieties Come and How to Remove Them
One of the most common problems faced by Xiaomi owners is false positives. The phone can suddenly sound an alarm in the middle of the night or in the theater, although there is no real threat. Most often this is due to the fact that the phone caught a signal from the tower that broadcasts the test message, but it was programmatically marked as real, or there was a failure in the determination of the location.
Another reason is a fault in the operator database or a failure to switch between towers (roaming), if you are near the border of a region or country, the phone may receive signals from a neighboring operator, where different broadcast rules apply, and the cause may be outdated firmware, which contains processing bugs of the Cell Broadcast protocol.
To resolve the problem, try the following steps:
- Restart the device to re-register on the network.
- Check for system updates in the About Phone menu.
- Temporarily disable all types of alerts except for Emergency alerts and check the system's response.
⚠️ Note: If false signals are constantly coming and interfere with your phone use, try extracting the phone. SIM-If the problem persists only with one particular card and insert it again. SIM-card, contact your operator - perhaps on the network side is incorrect mailing.
Technical details of false positives
Can I completely turn off the alerts?
The issue of shutting down completely is a pressing one for those who are annoyed by sudden sounds. On most global versions of MIUI and HyperOS, developers have left the ability to disable all but the most critical notification types. Completely "kill" the system at the kernel level without obtaining superuser rights (Root) is almost impossible, and insecure.
If standard menu switches don’t work (they can be gray or return to their original position), this means that there are strict regulatory requirements in your region. In countries such as the United States or Japan, manufacturers are required to deliver warnings. In Russia and CIS countries, settings are usually available for user editing.
There is a method of disabling through the engineering menu, but it requires caution. By entering the code ##4636## in the Phone app, you can get into the testing menu. However, in new versions of Android, access to the Cell Broadcast settings is often closed from here. ADB-commands to disable system packages can lead to unstable operation of the radio module.
| Type of notification | Possibility of disconnection | The risks of disconnection |
|---|---|---|
| Extreme Threat (Extreme) | Frequently blocked | High risk of missing the signal of life |
| Serious threat (Severe) | Available for switching | Average risk (weather, fires) |
| Amber's Alert (AMBER) | Available for switching | Low (relevant only in a number of countries) |
| Test messages | Available for switching | Missing (noise only) |
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Completely disabling system alerts at the firmware level is impossible without root rights, but you can turn off sound and vibration in the notification settings for a specific type.
Set up sound and vibration
If you don't want to give up the security feature completely, but you're scared of the volume, you can set up the audio. The Wireless Emergency Warnings menu often has an "Alert Sound" item, and if you change it to a quieter or neutral one, you can easily carry test switches.
You should also pay attention to the vibration settings. In some scenarios, for example, when the phone is lying down on the table, it is the vibration that helps you notice the important message. However, at night, constant vibration can be an irritant. Make sure that the Night or Dream profiles do not prohibit interruptions if you want to hear only the most important signals.
For advanced users, it is possible to change the sound configuration file, but this requires Root rights and knowledge in the field of editing Android system files. Standard means to change the volume of this channel separately from the total volume of notifications can not be linked to the system level of alarm.
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Use Sleep Mode in your screen settings. It doesn't block emergency screens, but it can change the behavior of the screen (not turn on bright backlights), which will keep your vision at night.