How to enhance the signal of cellular communication on the phone Xiaomi

The problem of poor mobile network reception on Xiaomi and Redmi smartphones is often a source of irritation, especially in areas of unreliable coverage or inside buildings with thick walls. Declining Internet speed, call interruptions and constantly switching between communication standards can make it difficult to use a device for work or entertainment, but in most cases, the situation is fixable without buying a new gadget if you approach the diagnosis correctly.

Modern smartphones have complex antenna architectures and software algorithms that sometimes require manual adjustments. Signal interference, outdated base station settings, or software failures in the communication module are the main reasons why your Mi or Poco stops “catching the network.” In this article, we will break down proven methods, from simple actions to deep tuning through an engineering menu.

Before proceeding to complex manipulations, it is worth eliminating trivial factors, such as damage. SIM-The stability of the connection depends on many variables, and a consistent approach will identify and fix the root of the problem. Let's start by analyzing the current state of the network and the basic settings of your device.

Diagnostics of the current signal level and operator selection

The first step is always to make an objective assessment of the situation. You should not rely solely on the number of sticks in the status bar, since this indicator is often subjective and can misleadingly display the real quality of the connection. To accurately diagnose, you need to know the numerical values of the signal power that are displayed in decibels (dBm). The closer to zero, the better reception; for example, -60 dBm is a great signal, and -110 dBm indicates a critically weak coverage.

To get accurate data on Xiaomi devices, you can use built-in tools or third-party applications. The signal level indicator in numerical format will help you understand whether you should try to improve reception by software methods at all or the problem lies in the physical lack of coverage of the operator in a given area.

• 📱 Open the dial menu and enter the code ##4636## to access the test mode.
• 📊 Select “Phone Information” and find the Signal Strength option).
• 📡 Please note the value of dBm: if it is lower -105, Software methods may be ineffective.
• 🔄 Try to extract SIM-card and insert it into another phone to prevent the breakdown of the communication module.

If the diagnosis has shown that the signal is really weak, but not critical (for example, -90...-95 dBm), it makes sense to check the settings of the preferred network type. Often the smartphone clings to an overloaded frequency range, negating a more stable but less fast. Network priority can be changed manually, making the device work only in a certain standard, for example, LTE or 3G, if 4G in your area is unstable.

Basic network settings and parameter reset

Often, the cause of communication problems is accumulated software errors or incorrect settings after updating the firmware. Network reset is a secure operation that returns connection settings to factory values, removing stored APN access points and Wi-Fi passwords, but without affecting your personal data, photos or applications.

This can be done through the standard settings menu, and once reset, the phone will re-register on the operator's network, often allowing a closer or less busy base station to be picked up, especially for users who often move between cities or areas with different coverage.

Another important aspect is APN verification. Operators periodically change the settings of the Internet connection, and automatically updating these settings may not work. APN settings must meet the current requirements of your operator; incorrect settings can lead to slow data speeds even with good signal strength.

⚠️ Note: Before resetting your network settings, make sure you know the passwords from your Wi-Fi networks, as they will be deleted. SIM-cards have funds, as after reset may require re-authorization in the network.

Using an engineering menu to select frequencies

One of the most effective ways to improve reception on Xiaomi is to manually control frequency ranges through an engineering menu. Operators use different frequencies (Bands) to transmit the signal: low frequencies (for example, Band 20) are better at penetrating walls and working over longer distances, and high frequencies (Band 3, Band 7) provide high speeds but have a short range.

To access these settings, you can use the code ##4636## or special applications like Network Signal Guru (require ADB or Root rights), and in the Network Preferred Type Settings menu, you can select LTE Only mode to prevent your phone from switching to 3G or 2G, which often solves the problem of constant speed surges.

Path to hidden menu (requires activation via ADB on new firmware):


adb shell am start -n com.android.settings/.DevelopmentSettings

It is important to understand that turning off certain bands can lead to the complete disappearance of the network if there is no coverage at the remaining frequencies in your location. The choice of range should be based on knowledge of what frequencies your operator uses in a particular place.

• 📶 Band 20 (800 MHz): Perfect for countryside and thick-walled buildings.
• ⚡ Band 3 (1800 MHz): Main range for cities, speed and coverage balance.
• 🚀 Band 7 (2600 MHz): High speed near towers but fails to break through walls.
• 🏗️ Band 38/40/41: Frequency for high load zones (stadions, shopping centers), give a huge increase in speed.

Physical factors and accessories for enhancement

Keep in mind that physical obstacles and accessories can significantly affect reception quality. Modern smartphones have built-in antennas located around the perimeter of the case, and a metal case can shield the signal, turning your phone into a “jammer” of itself.

Take off the case and see if the signal level changes, and if you're using a thick case of protection with metal inserts or magnetic holders, it's almost guaranteed to degrade the connection. SIM-Old cards that you have moved from phone to phone may have oxidized contacts or be cropped incorrectly.

And the quality of communication is also affected by interference from other electronic devices. Microwave ovens, powerful Wi-Fi routers, and power lines can create background noise. Electromagnetic compatibility is an important aspect, and sometimes just stepping a couple of meters to the side or holding the phone to the window to make the signal more stable.

External amplifiers and repeaters of cellular communication

If the software methods and replacement SIM-The cards don’t help, and you are in an area where the signal is, but it is very weak (for example, in the basement of an office or a country house), the only solution is to use external equipment. Cellular repeaters are devices that receive a weak signal from the street, amplify it and broadcast it inside the room.

To use a repeater, you need to install an external antenna in a place where it catches at least some signal (on the roof or outside the window), and connect it with a cable to an amplifier indoors. The effectiveness of the repeater depends on the quality of the external signal: if the outside is -115 dBm, the amplifier may not work or work unstable.

⚠️ Note: Using uncertified signal amplifiers may interfere with the operator's base stations and violate the law.

There are also passive antennas that connect directly to the smartphone, but for modern monoblock Xiaomi this solution is almost not applicable due to the lack of external connectors for antennas.

Software Solutions and Firmware Update

Sometimes the problem lies in the software of the smartphone itself. Errors in the modem part of the firmware (basic version) can lead to the radio module not working properly. Check for system updates in the Settings menu → About the phone. Xiaomi manufacturers regularly release patches that fix communication problems.

Also worth noting are applications that may conflict with system communication processes. Third-party optimizers or “signal amplifiers” from Google Play are often useless and waste battery life because they don’t have access to the hardware layer of antenna management. The only exception is the APN or network switching apps we talked about above.

💡

If you upgrade to a new version of MIUI or HyperOS and the connection deteriorates, try resetting your network settings. Often new firmware requires recalibrating network settings.

In rare cases, manual operator selection helps. SIM-You can turn off automatic network selection. Once you scan the available networks, you can manually select your carrier, which can tie your phone to a particular tower, even if it's further away, but it runs more robustly in roaming mode within the network.

Frequently Asked Questions (FAQ)