Modern Xiaomi smartphones support many frequency bands, which provides a stable 4G and 5G signal in different conditions. However, users often face situations when the Internet speed drops, and the indicator shows a confident reception, in such cases, you need to understand what frequency your device is currently operating.
Checking the operating frequencies allows you to determine the load of the operator tower, assess the quality of the coverage and even identify potential problems with the antenna module. For Xiaomi owners, this is especially important, since the company uses different sets of chips Qualcomm and MediaTek, each of which has its own features of displaying technical information.
In this article, we will look at all the diagnostic tools available, from built-in engineering menus to third-party utilities, and learn how to interpret the data and, if necessary, switch the device to a more stable range to improve communication quality.
Why you need to know the operating frequency of the network
Understanding how your Xiaomi smartphone interacts with base stations gives you a huge advantage when setting up a connection. Frequency is not just an abstract number, but a physical radio wave parameter that determines the signal's penetrating capacity and range. Low frequencies like 800 MHz are great at punching through building walls, but have low bandwidth.
High frequencies, like 2600 MHz or 3500 MHz in fifth-generation networks, provide the highest data rate, but they fade very quickly when you move away from a tower or encounter obstacles. Knowing the current frequency, you can explain why the phone is catching the network in the basement of the house, but the Internet is not working, or why the speed is maximum outdoors.
Also, frequency check is necessary when buying a new device for use abroad or from another carrier. Not all Xiaomi models support the full range of Bands used in your region. Global versions often differ from the Chinese list of supported frequencies, which directly affects the ability to work in the world. 4G/LTE.
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Engineers use this data to fine-tune the equipment, but it's also useful for the average user to be able to read these parameters, which helps to avoid unnecessary calls to the service center if the problem is not the breakdown, but the peculiarities of the operator's signal distribution.
The fastest way to access hidden network settings is to use special codes in the Phone app. On Xiaomi smartphones, depending on the processor (Snapdragon or MediaTek), these codes may differ. To begin with, just open the dial and type in the combination ##4636##.
If the code is good, the Verification menu will appear on the screen, and you are interested in the Phone Information section, which displays basic parameters: signal level (RSSI), network type and base station ID. However, this data may not be enough to analyze the frequencies in detail, since Xiaomi often hides a specific band number (Band) in the standard Android interface.
⚠️ Warning: Do not change the settings in the Network Type Selection menu unless you are sure of your actions. Forced switch to Only mode GSM» or "Only" LTE» This can lead to temporary loss of communication.
For MediaTek processor-based devices (Helio and Dimensity series), code ##3646633## often runs. It opens a deep engineering menu where you can find details about the connection in the Telephony section, and it is more likely to see the specific Band Number used.
It is worth remembering that on newer versions of MIUI and HyperOS, access to these codes may be restricted by the manufacturer for security reasons, in which case the system will simply ignore the input or show a standard settings menu.
What do I do if the codes don't work?
If standard USSD-commands don't open the engineering menu, which means your version of the shell MIUI It blocks that access. Try installing the app «MTK Engineering Mode" from Google Play for MediaTek processors. For Snapdragon, there is almost no root-free capability. Detailed analysis through the Network Signal Guru app When Xiaomi's standard tools don't give the full picture, specialized applications come to the rescue. Network Signal Guru is a leader in this field, and it's a professional tool that requires root rights to work, but even in normal mode, it shows significantly more information than system settings. Once the application is installed and launched, you must give permission to access the location and phone. The main screen of the program displays a graph of the change in the signal level in real time. The colors of the indicators help you navigate quickly: green means a great signal, yellow means satisfactory, and red means bad. The key feature of the program for our task is the ability to display a specific range number (Band). At the top of the screen or in (Details) you will see signs like LTE Band 3, Band 7 band 20. These are the numbers that are the frequencies you are looking for. 📡 Band 3 (1800 MHz – the most common range in cities, providing a balance of speed and coverage. 📡 Band 7 (2600 MHz) – high-speed range, operates mainly in line of sight from the tower. 📡 Band 20 (800 MHz – long range, ideal for rural areas and passing through walls. 📡 Band 38/40/41 — You can use the logging function to record the route and see the phone switch between the towers. It is an indispensable tool for finding dead zones or checking the quality of communication in a new apartment before buying. ☑️ Network Quality CheckInstallationAppPlantGive permissionsGo outdoorSecret indicatorsCompared to coverage mapCompleted: 0 / 5 Table of major frequency ranges LTE In order to correctly interpret the data obtained in the engineering menu or third-party applications, it is necessary to understand which band number (Band) which frequency corresponds. Below is a table of the main frequencies you will encounter when checking, and knowing these parameters will help you understand why in one room the phone flies, and in another, it barely loads pages. Range (Band) Frequency (MHz) Characteristics Where Band 3 1800 is used LTE Cities, suburbs Band 7 2600 High speed Cities, Band 20 800 Stadiums High penetration Village, cellars, Band 38 2600 tracks (TDD) Please note that Carrier Aggregation allows the phone to use multiple bands at once to increase speed «LTE-A» or «4G+». In this case, the phone can show the main range, but in fact work with several different types of devices. ⚠️ Note: Support for specific Bands depends on your Xiaomi model.Budget models may not support Band 20, which is critical for working out of town. Check through ADB For advanced users who do not want to get root rights, but need detailed information, there is a method of debugging through a computer. ADB on the PC and enable “Debugging by USB» You can put a cable on your phone, you can send commands that read data from the modem, and the adb shell dumpsys telephony.registry command produces a huge amount of data about the state of the network. The code lines include cellBandwidth and cellFrequency. adb shell dumpsys telephony.registry | grep -i This method is less convenient for continuous monitoring, because it requires cable connection and command line work. MIUI. This is especially useful in diagnosing switching problems between 3G and 4G. You can also use graphical shells for ADB, such as Xiaomi ADB/Fastboot Tools, which have built-in monitoring functions. They make it easier to read logs and allow you to export data for further analysis. The effect of frequencies on speed and autonomy The frequency choice directly affects not only the Internet speed, but also the power consumption of your Xiaomi. Operating at high frequencies (2600 MHz and above) requires the modem to maintain the connection, especially if the signal is unstable. This leads to a faster battery discharge. If you are able to reconnect to the phone, you can often re-infly try to re-site the data zone. Switching to a lower frequency (e.g., 1800 or 800 MHz) often solves the discharge problem, even if the Internet speed drops slightly. On the other hand, frequency aggregation, while giving you speed gains, also increases the load on the processor and modem. 4G+ or 5G The heat of the housing can be noticeable even with moderate use, and understanding this balance helps you manually select the network modes in the developer menu to save energy in critical situations. Some users resort to locking the phone to a specific range through a Lock to specific Band, which can be useful if you know that a specific frequency is best caught in your home, and the phone constantly jumps to the next one with the worst signal. 💡A stable signal at a medium frequency is better for autonomy than an unstable one at the maximum available frequency. Frequently asked questions (FAQ) Can you increase the speed of the Internet by changing the frequency manually? Yes, if you are in the area where the phone picks up a loaded low-frequency tower (Band 20), and there is a free high-frequency tower (Band 7). Forced switching can give you a boost in speed, but only if you have a good signal level. Why is the band number not visible in Xiaomi settings? Xiaomi, in order to minimize the interface, hides technical information in the standard About Phone menu. Engineering codes must be used to display this data, ADB-It's not good to use the engineering menu all the time, it's not good to use the engineering menu, it's absolutely safe to view the data in the engineering menu. The risk is only a change in settings (e.g., turning off certain ranges or changing the transmitter power) that could lead to loss of communication or unstable device performance. Snapdragon is standard code ##4636##. However, the depth of available information in the engineering menu on Snapdragon is often less than on MediaTek, so using third-party applications is preferable. How do I get all the network settings back if I change something? The easiest way is to reset your network settings. Go to Settings. → Connection and sharing → Resetting Wi-Fi, mobile networks and Bluetooth, which will bring all frequency and operator selection parameters back to factory values.