Xiaomi smartphones are well-deservedly known for their excellent price-performance ratio, but even top-end models sometimes face signal reception problems. Device owners often complain of periodic network disappearance, a drop in Internet speed or the inability to make a call in areas of uncertain reception, this can be due to both software limitations and hardware features of a particular region.
Signal amplification is a complex task that requires understanding how a radio module works. Simply restarting a device does not always solve the problem, especially if the cause is incorrect network settings or physical damage to the antenna. It is important to consistently all possible reasons, from software settings to verification. SIM-map.
In this article, we will discuss effective methods to help stabilize the connection, learn how to choose the right type of network, use the engineering menu to force the selection of a base station, and what folk methods really work and which are myths.
Diagnostics of problems with mobile network
Before we go to radical measures, we need to pinpoint the source of the problem, and users often confuse the bad signal with overloading the operator's tower or technical work. SIM-If the other phone is stable, then the problem is localized in your Xiaomi.
Note the indicators in the status bar. Flashing icons or switching between 4G, 3G and E indicates that the phone is on the boundary of coverage of two different towers, in which case the device spends battery power and CPU resources constantly searching for the best signal, leading to heat and lag.
⚠️ Warning: If your phone suddenly stops seeing the network after falling or getting moisture, don’t try to “warm” it or knock on the body.
For more advanced diagnostics, you can use special applications from Google Play, such as Network Cell Info or OpenSignal, which allow you to see the signal level in dBm (decibel-milliwatt), the normal value is from -70 to -90 dBm. If you see values below -110 dBm, then the connection will be unstable even at the full scale of divisions on the screen.
Basic network settings in MIUI and HyperOS
The MIUI shell operating system and the new HyperOS have many hidden settings that affect modem operation. The standard network selection algorithm is not always optimal, as it seeks to connect you to the fastest available network (e.g. 5G), even if its signal is weaker than that of a stable 4G. Forced network mode switching often solves the problem.
To change the settings go to the Settings menu → SIM-Maps and mobile networks. Choose the right one. SIM-You can click on the network type, and you can experiment with the options here. 5G, It makes sense to switch to Preferably. LTE. This will prevent constant jumps between communication standards.
☑️ Checklist of basic settings
Another important feature is the VoLTE function (Voice over). LTE). It allows you to transmit high-quality voice through the channel. 4G. However, on some older towers or when the signal is weak, this feature can cause call interruptions. Try turning off VoLTE in the same settings menu. SIM-check if the connection stability has improved.
Use of engineering menus and hidden codes
For advanced users who want to have full control of the radio module, there is an engineering menu, a hidden interface designed for testing equipment by plant engineers, where you can manually select the frequency or block certain ranges that cause interference.
To enter the menu, open the Phone app and dial the code ##4636##. If the code is not working (it is blocked on some firmware versions), you can use the Activity Launcher app by searching the list "Testing" → "Phone information." In the menu that opens, find the Set Preferred Network Type section.
⚠️ Warning: Do not change the settings in the sections, the value of which you do not know. In particular, avoid resetting the antenna calibration, as it will be impossible to restore factory parameters without special equipment.
The list of network types can be selected LTE This mode forces the phone to work only on networks. 4G, ignore 2G and 3G. This is useful for a stable Internet, but remember that in this mode incoming calls through a regular network may not pass unless you configure VoLTE. LTE/TD-SCDMA/WCDMA/GSM.
What if the code doesn't work?
Physical factors and the impact of accessories
Often, external factors are the cause of a bad signal, which users forget about. Modern smartphones have built-in antennas, the location of which depends on the model. Most often, antenna lines are located in the upper and lower parts of the body or integrated into the frame, closing these areas with dense materials can reduce the signal level by 30-50%.
Special attention should be paid to protective cases. Metal cases, magnetic clasp cases or thick rubberized reinforced models can shield the signal. If you notice a deterioration in communication after buying a new accessory, try removing it and checking the signal level again.
| Type of case | Effect on signal | Recommendation |
|---|---|---|
| Thin silicone/TPU | Minimum | Safe to use |
| Metal plate/frame | Critical | Replaces the antenna circuit, the signal drops |
| Magnetic holder (automobile) | High. | Remove magnets when calling |
| Thick shock-proof (Rugged) | Medium/High | Check in areas of poor reception |
It is also worth checking the condition of the tray. SIM-If it's deformed or not fully inserted, the antenna module inside the phone may be in contact with the device. Remove the tray, wipe the contacts with an alcohol napkin, and insert back until the characteristic click.
Resetting network settings and software updates
Accumulation of software errors during operation can lead to malfunctioning of the network stack. The operating system can get stuck on the parameters of the base station, which is no longer optimal. Network reset returns all connection parameters to factory values, removing stored APN access points and Bluetooth pairing.
To perform the reset, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Press Reset button at the bottom of the screen. After this procedure, the phone will restart, and you will need to re-enter passwords from Wi-Fi networks.
💡
Before resetting your network settings, take a picture of your carrier’s current APN settings, if they have been manually changed, which will allow you to quickly restore access to mobile Internet if the automatic settings do not apply.
Don’t forget about system updates. Xiaomi engineers regularly release patches that fix the modem and improve compatibility with the equipment of various carriers. Go to Settings → About the phone and check for updates. Sometimes the problem with the signal is solved by installing a new version of the firmware.
Hardware solutions and external amplifiers
If software methods have not helped, and the problem is relevant for a particular room (office, country house), it is worth considering hardware solutions. Internal antennas of smartphones have physical power limitations. For stationary use, an effective solution can be the installation of an external signal repeater.
A repeater is a device that picks up a weak signal from the street, amplifies it, and broadcasts it indoors, but it requires an external antenna to be placed on the roof or facade of a building, a costly but only possible solution for dead signal zones.
There's also a myth about antenna stickers on the phone, which tend to be zero in effectiveness, which are not active amplifiers, and they can't change the physical properties of the built-in antenna on the smartphone, and it makes no sense to spend money on them, and it's better to invest in a quality case or power bank for the stable operation of the device.
💡
A comprehensive approach, including resetting, choosing the right type of network and checking accessories, solves 90% of the communication problems on Xiaomi.