Modern Xiaomi, Redmi and POCO smartphones are famous for their excellent price-performance ratio, but owners often face unstable connections. When the device does not work well, the Internet can be caused by software failures of the MIUI or HyperOS shell, incorrect operator settings or even physical features of the antenna module. Users often notice that the 4G indicator is on, but the pages do not load, or the Wi-Fi signal is interrupted when you move to another room.
In this article, we will take a closer look at the main reasons why mobile internet or wireless network behave unpredictably on Chinese brand gadgets. APN, should be changed DNS-We will also discuss the topic of hidden engineering menus that allow you to diagnose the signal level more accurately than standard indicators.
Before you can bring your device to the service center, you need to eliminate software errors that occur in 90% of users. Often the problem lies in the banal frequency conflict or outdated operator profiles that are stuck in memory after updating the system. Competent diagnostics will help you restore a stable data rate without unnecessary costs.
Software failures of the shell MIUI and HyperOS
MIUI and its successor HyperOS have an aggressive power-saving system that sometimes works against the user, which can force the user to break the connection or restrict background data transfers for certain applications, creating the illusion of poor Internet, especially after a firmware update, when old configuration files conflict with new system rules.
Another common cause is the crowded cache of Google Play system services or the interface itself. When temporary files occupy a critical volume, the process of synchronizing time and network tokens can freeze. As a result, the phone shows the presence of a network, but the actual exchange of data packets does not occur.
⚠️ Note: Before performing a network reset, make sure you remember passwords from your Wi-Fi networks, as they will be deleted without the possibility of recovery.
It is also important to check whether Traffic Saving or Limit Connection mode is activated in the system settings, which are designed to protect the user’s budget, can block heavy content or updates from loading in the background, and disabling these restrictions often instantly returns normal speed.
💡
Use the built-in security function» → «Speed» → «Traffic” to check whether the speed limit is worth the specific application or SIM-map.
Incorrect Access Point (APN) settings
One of the main technical reasons why Xiaomi is not working well on the Internet is the wrong access point settings. APN (Access Point Name: Operators change gateway addresses periodically, but the phone may still have old records, especially if you used this service. SIM-card in other devices or roaming. incorrect type of protocol (for example, IPv6 instead IPv4/IPv6) It also causes the loss of packets.
To correct the situation, you need to manually check and, if necessary, create a new access point. → SIM-maps and mobile networks → Choice SIM-map → Access points (APN). You should select an active operator and check the matching of the parameters with the official data on your provider's website. Often a simple action helps: click the Reset or Restore by default button at the bottom of the screen.
If automatic reset didn't work, create a new access point manually, entering data carefully. Pay special attention to the Name fields and «APN» — They must meet the requirements of the operator. DNS-manual servers, such as those from Google (8.8.8.8) or Cloudflare (1.1.1.1), to get around domain name resolution issues.
☑️ Checking settings APN
Problems with Wi-Fi module and frequency ranges
Xiaomi smartphones support two Wi-Fi bands: 2.4 GHz and 5 GHz. The 5 GHz range provides high speeds but has a shorter range and passes through walls worse. If your router broadcasts the same network (SSID) in both bands, the phone may try to hold on to a weak 5 GHz signal instead of switching to a stable 2.4 GHz, which leads to permanent connection breaks.
In addition, Wi-Fi settings on Android include a Wi-Fi Assistant (or Switch to Mobile Data) feature that is designed to automatically switch to mobile internet if the Wi-Fi signal becomes weak, but in practice, this feature often works incorrectly, creating a dead zone when Wi-Fi is still catching, but the Internet is not working and the phone does not switch to the mobile network.
It is also recommended to disable the use of randomization MAC-Some older routers or providers may lock the device when you change virtual addresses frequently, and for that purpose, you need to find the Privacy option in your specific Wi-Fi settings and select Use. MAC-address».
What is randomization? MAC-address?
Impact SIM-map and physical wear of contacts
You should not write off the physical condition of yourself. SIM-Over time, the contacts on the chip oxidize or wear off, which leads to an unstable connection to the phone's communication module. 5-7 years or has traces of mechanical damage (cut out of format) Mini/Micro Nano, the probability of Internet problems increases significantly.
It's also important to check the density of the card in the tray. POCO The tray may have a backlash, which causes contact to disappear when you fall or vibrate. SIM-If you can, replace the old card with a new card in the operator's cabin, which is often free or symbolically worth the service.
Another thing is that you support communication standards, if you're using very old ones. SIM-The card may not support the full 4G/LTE or VoLTE, working only in mode 3G, Make sure your card meets the current communication standards of your region.
Comparison of causes and methods of decision
For a quick diagnosis of the problem, it is convenient to use a table that systematizes the symptoms and how to eliminate them, which will help you not waste time on unnecessary actions and immediately move to a solution that suits your situation.
| Symptom of the problem | Probable cause | Method of decision |
|---|---|---|
| 4G indicator is available, but pages are not loaded | DNS or APN error | Resetting APN settings, DNS 8.8.8 |
| Wi-Fi only works near the router. | Problems with the antenna or 5 GHz band | Switch to 2.4 GHz, check the case |
| The Internet is lost when you call. | VoLTE is disabled | Activate VoLTE in the settings SIM-map |
| Network disappears after software update | System configuration failure | Reset network settings or complete reset (Wipe) |
Analysis of the table shows that most problems are solved by software, but if none of them works, it may be the hardware.
💡
If the problem is only one specific problem SIM-The card, and others work normally - the reason is the operator or the card, not the phone.
Diagnostics through the Engineering Menu
For a deeper analysis of the signal level, you can use the hidden engineering menu Xiaomi. It is a powerful tool that allows you to see the real signal level in dBm, not just “rods” on the screen. Normal level is considered a value from -70 to -90 dBm. If values are below -110 dBm, then stable Internet operation in your area is almost impossible.
To enter the menu, open the Phone app and dial the combination ##6484##. From the menu that opens, select SIM Card Status or Phone Info. You can also force the network mode to switch, such as making the phone only work in LTE (LTE Only) mode, which sometimes helps in areas of uncertain reception, where the phone constantly “jumps” between 3G and 4G.
⚠️ Warning: Be careful when changing the settings in the engineering menu. Incorrect setting of network mode (for example, LTE Only on SIM-A card without VoLTE may cause you to stop receiving incoming calls.
Using this tool allows you to objectively assess whether the problem is a software setup or if you are in the zone of “radio silence”, where no phone will be able to show a good result.
Hardware malfunctions of the antenna module
If software methods, resetting and replacement SIM-The cards failed, there's a hardware problem. In Xiaomi smartphones, the antenna module can fail due to falls, moisture or factory defects. Often the antenna plume that connects the main board to the case or plastic inserts departs.
Symptoms of hardware breakdown include: complete absence of a network ("No service") even in the city center, severe heating of the lower part of the phone when trying to find a network, or a sharp drop in signal level when changing the position of the device in the hand, in which cases it is necessary to disassemble the device and diagnose it by a specialist.
Repairing the antenna module usually does not require replacing the entire board, often enough to solder the connector or replace the antenna plume itself, which is a relatively inexpensive procedure in an authorized service center.