Why Xiaomi’s network is missing: a complete troubleshooting guide

The situation when the usual 4G or LTE indicators suddenly disappear on the smartphone screen, and instead of them there is a cross or the inscription “No network”, familiar to many owners of Xiaomi equipment. This is not just an annoying failure, but a serious communication violation that can catch the user off guard at the most inopportune moment. The problem often lies in the software conflicts of the MIUI shell or HyperOS, but we can not exclude hardware malfunctions of the antenna module.

Before you bring the device to the service center, you need to conduct a number of diagnostic procedures that in most cases allow you to return the connection without financial costs. SIM-The card has lost contact with the patches. It's important to act consistently, eliminating simple reasons before moving to a complex one.

In this article, we will look at why the network on the Chinese brand devices is missing and how to fix the malfunction yourself. We will look at both software methods for solving through the settings menu and hidden engineering codes that help reboot the radio part of the phone.

Main Causes of Signal Loss and Failure SIM-map

The first thing to do is to eliminate physical factors and problems with the carrier itself. SIM-The card is a physical carrier that wears out over time. Microcracks on the chip or oxidation of contacts can cause the network to periodically disappear, especially when the temperature is vibrating or falling.

Also consider the coverage of your operator in the current location. in basements, metal structures of buildings or remote areas, the signal can be unstable. Xiaomi smartphone may try to “catch” the network, quickly discharge the battery, but will not be able to establish a stable connection.

For primary diagnosis, follow the following steps:

• 🔄 Extract. SIM-map, wipe the contacts with a soft cloth and insert back, making sure the orientation is correct.
• 📶 Check the signal level on another device with the same operator’s SIM card in the same location.
• ⚙️ Move the SIM to another slot if your smartphone supports two cards at the same time.

💡

If you're old. SIM-The card you used more than that. 5 Older cards may not support modern encryption protocols and frequencies. 4G/LTE.

In some cases, the problem is solved by a banal reboot of the device, which clears the temporary caches of the radio module. If after the reboot the network did not appear, and on other devices there is a signal, then the problem lies deeper in the settings of the phone or its hardware.

Network settings and choice of connection type

One of the most common reasons why the Internet or voice communication is lost is the incorrect settings of the preferred network type. In the pursuit of maximum speed, users often choose 4G only or 5G only mode, which in areas of uncertain reception leads to a complete lack of communication, as the phone ceases to “see” older but stable 2G and 3G towers.

It is recommended to set automatic network selection so that the smartphone can flexibly switch between communication standards. → SIM-maps and mobile networks → Choose. SIM-map → The preferred type of network is the best option to choose "Preferred". 4G (LTE)" or "auto" that will provide a balance between speed and stability of coverage.

The VoLTE (Voice over) function is also worth noting. LTE), which allows voice calls to be made over the network 4G. On some Xiaomi and Redmi models, this feature may not work smoothly with certain carriers, causing connection breaks. SIM-Maps and check if the situation has improved.

If you’re in an area where 4G coverage is weak, the phone will be constantly searching for the network, which not only leads to loss of communication, but also to a quick battery drain. In such cases, a forced switch to 3G mode preferably can be a temporary but effective solution to preserve the ability to call.

Resetting the settings of the APN access point

Often, the network indicators are on, but the Internet is not working, or the network disappears completely when you try to transfer data. This is a classic symptom of a failure in the settings of the APN access point (Access Point Name), these parameters are prescribed by the operator automatically when you first install the SIM card, but after updating the system or changing the region they can be lost or damaged.

To correct the situation, you need to manually reset the settings. APN Go to the factory values. Go to the Settings menu. → SIM-maps and mobile networks → Choose. SIM-map → Access points (APN). At the bottom of the screen or in the menu (three dots in the corner) find the button "Reset" or "Reset to default settings".

Once the reset is done, the phone will request the configuration from the operator again. If the automatic configuration has not occurred, the parameters (name, APN, login, password) can be found on the official website of your mobile operator, and correctly entered data ensures stable access to the mobile Internet.

Importantly, after changing the APN settings, it is imperative to turn on and off flight mode or reboot the device to make the changes take effect.Without this step, the phone can continue to use old, non-working settings.

Using the Engineering Menu for Diagnostics

For a deeper diagnosis of the radio module in smartphones Xiaomi there is a hidden engineering menu. SIM-It's a powerful tool to tell if the device sees the SIM card at the software level.

To enter the engineering menu, open the Phone app and dial ##4636#. If the code is entered correctly, the Check menu will open. Select Phone Information. Here you will see detailed statistics: network type, signal strength in dBm, state SIM-map.

The menu also includes the "Run Ping Test" feature, which checks the connection to the Google server. If the ping doesn't go through, the connection is exactly the problem. In addition, you can find the drop-down list "Install preferred network type", where you can force the LTE Only standard to check the antenna's performance in a particular range.

⚠️ Warning: Be extremely careful about the engineering menu. Changing settings you are not sure about (such as resetting the radio or changing frequency bands) can cause the phone to stop seeing the network at all or lose the ability to make emergency calls.

If the column “State of the SIM-maps display "Disconnected" or "Unknown", although the physical map is installed, this may indicate a software firmware failure or a reader malfunction.

Resetting network settings and software updates

If previous methods have failed, it is worth resorting to more radical but safe measures: Network reset is a procedure that returns all connection parameters (Wi-Fi, Bluetooth, mobile network) to factory values. It does not delete your personal files, photos or contacts, but erases saved passwords from Wi-Fi.

You can reset via the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth → Reset. After this operation, the phone will reboot and you will have to re-enter passwords from wireless networks, but often this completely solves the problem with the lost mobile network.

It is also critical to keep up-to-date with the software. Xiaomi regularly releases updates that fix modem errors and optimize communication. Check for updates in Settings → About Phone → MIUI (or HyperOS) version.

Sometimes the problem arises after the update, in which case it is worth waiting for the patch to come out or, if the problem is critical, consider rolling back on the previous version of the firmware, although this requires more complex manipulation of the computer.

💡

Network resets are the middle ground between simply rebooting and completely resetting your phone, and eliminate 90% of software conflicts associated with connecting to cell towers.

Remember that older firmware versions may contain bugs that have already been patched by developers, and ignoring security updates and system patches can lead not only to communication problems, but also to vulnerabilities in your data.

Hardware malfunctions and communication module

When all software methods are exhausted and the network continues to disappear or disappear altogether, there is a high probability of hardware malfunction. Xiaomi smartphones, as with any complex electronics, can eventually have problems with soldering of the antenna module, especially if the device has been hit or dropped.

A common cause is the oxidation of the antenna contacts or the departure of the plume connecting the main board to the antenna unit. In such cases, light pressure on the back cover in a certain area can temporarily restore the signal, which is a sure sign of a mechanical problem.

Also, you should consider the wear and tear of the radio module itself. During prolonged use and overheating (for example, during long conversations or games), the communication chip can degrade, which is manifested in the fact that the phone begins to warm up strongly in the area of the camera, and the network disappears at the most inopportune moment.

• 📱 Smartphone is strongly warmed in the upper part of the case when trying to find a network.
• 📉 Signal indicator jumps from full to no network without changing location.
• 🔌 The phone only sees the SIM card after multiple reboots or taps.

⚠️ Note: If you notice that the phone stopped seeing SIM cards of different operators, and on other devices these SIM cards work properly, with a probability of 99% the problem in the antenna module or motherboard of your smartphone.

Self-repair in case of hardware problems is not recommended, as it requires special equipment and skills of microscopic soldering. Trying to disassemble the phone without experience can damage the plumes and ultimately fail the device.

The Impact of Third-Party Applications and Viruses

And the software power of third-party applications should not be discounted: Some “optimizers,” “antiviruses,” or traffic-saving apps can aggressively control network connections by forcibly shutting down mobile networks to save power, especially for devices with custom firmware or root rights.

Analyze whether you've recently installed applications that require access to network management. Try running your phone in Safe Mode. To do this, press the off button, and when the off icon appears on the screen, click on it and hold it until the prompt to go to Safe Mode appears, and if this mode is stable, then one of the installed applications is to blame.

There is also a risk of malware infection that blocks network functions for hidden mining or spam sending.Do a full device check with built-in Security antivirus or a reliable third-party solution.

To sum up, the stability of Xiaomi’s communications depends on many factors, from the state of the SIM card and the APN settings to the physical health of the antenna. A consistent check of all the described items will allow you to identify and eliminate the cause of the malfunction, returning the smartphone to full functionality.