How to find out supported Xiaomi LTE frequencies: The complete guide

Owning a modern Xiaomi smartphone involves anticipating high Internet speeds, but users often face unstable signals or low data rates. The main cause of these problems is often not a weak operator signal, but incompatibility of the hardware of the device with the frequencies at which the base station operates in your area. Understanding which LTE bands your device supports is critical to choosing the right operator or setting frequency aggregation.

Many owners of Redmi and Poco devices don’t even realize that their phone can’t physically “see” a signal from a particular tower if it’s broadcasting at a frequency that’s not in the modem specification, especially when traveling abroad or living in rural areas where 4G coverage is just emerging. In this article, we’ll go into detail on software and hardware methods for determining supported bands.

We'll look at the built-in diagnostic tools, the hidden engineering-level menus, and the third-party tools that allow you to peek under the hood of a radio module, and the data will help you understand why the interlet flies in some places and barely loads pages in others, and whether you should consider changing your SIM card or even your smartphone.

Theoretical Basis of LTE Bands and Their Influence on Speed

Before we get to the basics of radio, we need to understand basic concepts: the fourth generation (4G LTE) network operates in different frequency bands, which are designated by Band numbers. Each carrier rents licenses to use specific frequency bands, and the coverage is built on them. If your Xiaomi smartphone does not support the right Band, it simply will not be able to connect to the network, even if the tower is in line of sight.

Low frequencies, such as the Band 20 (800 MHz), have excellent penetration and cover vast areas, including basements and remote villages. Medium frequencies, such as Band 7 (2600 MHz) or Band 3 (1800 MHz), provide the main network capacity in cities. High frequencies are designed for ultra-fast data transmission over short distances.

⚠️ Global versions of Xiaomi smartphones usually support a wide range of frequencies, while Chinese versions (CN Version) may have a stripped-down Band list, which is critical for Europe and the CIS.

Modern modems in Snapdragon and MediaTek processors can combine multiple bands simultaneously, a technology known as Carrier Aggregation. However, at least one basic supported band is critical to starting a connection and running sustainably in poor conditions. The lack of support for Band 20 or Band 38 in our latitudes often makes a smartphone almost useless for mobile Internet out of town.

Using the MIUI engineering menu to diagnose modem

The fastest and safest way to get the primary information about your current connection and supported modes is to use the built-in engineering menu. The MIUI and HyperOS shells have a special code that displays a hidden testing interface. To access it, open the standard Phone app and type in the combination ##4636#. If the menu does not open automatically, it may be blocked on your device by the operator or manufacturer.

After entering the menu, select Phone Information. This list will often show all modes that a modem can theoretically support, including various combinations of GSM, WCDMA, and LTE. Having an "LTE Only" option or specific Band prefix in the mode description can give a hint of the device's capabilities, although the full frequency list is not usually displayed here.

At the bottom of the Phone Information screen, you can see the Connection Details block. Here, in real time, you can see the current Band that the phone is running on, the signal level (RSRP), the signal quality (SINR) and the frequency in MHz. This gives you an idea of what frequency you're sitting at right now. If you see the phone holding a signal on the Band 3 but the specification says Band 20, it could mean that the Band 20 is missing or the phone prefers a higher speed range.

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If the ##4636### code doesn’t work, try entering it in the Engineering Mode app, which can be found through a search in the settings or download from the Mi Store.

Importantly, the engineering menu shows the current state and preferences, but does not always provide an exhaustive list of all physical frequencies "sewn" in the modem. For a deeper analysis, you will need to use specialized software that can read the reports of capabilities (capabilities) directly from the firmware modem.

Checking through the 4G Finder app and similar utilities

For users who don’t want to delve into complex technical menus, third-party apps from Google Play are a great solution. One of the most popular and informative tools is the 4G Finder or Network Cell Info Lite app. These programs have access to the Android API, which allows you to query the modem for a list of supported frequencies and display them in a convenient graphical form.

Once installed and given the necessary permissions (location and phone access), the app will show a tower map and a frequency list. In the device information section (Device Info), you can often find the "Supported Bands" or "LTE Bands" item. Here will be a complete list of range numbers that your Xiaomi hardware supports, which is the most accurate software way to get data without root rights.

The advantage of these tools is that you don't just see a dry list of numbers, but you can also see which frequencies are active right now and which are available in theory. The app can show that your phone supports Band 1, 3, 7, 20, 38, 40, but only a couple of them are available in the current location, and it helps to weed out coverage issues from compatibility issues.

It is worth considering that some manufacturers may restrict applications from accessing the full frequency list through standard Android APIs. In such cases, the application can only show the ranges that the operator is using right now. To get a full picture in such situations, you will need to use more advanced methods, such as ADB or log analysis.

Analysis of supported frequencies through ADB and modem logs

For advanced users who have command line skills, the most reliable method is to analyze logs through debugging by USB. This way you can get information directly from the modem drivers without the limitations of the Android interface, USB-cable and installed Android package SDK Platform Tools.

The first thing you need to do is activate the debugging mode on your smartphone. Go to Settings. → About the phone and seven times quickly click on the build number (MIUI Then, in the advanced settings, turn on "Debugging by" USB". Connect the phone to the PC and in the command line enter the command to get a list of supported LTE-For many Qualcomm modems used in Xiaomi, there is a team to request information about capabilities.

adb shell service call phone 123 s16"getLteBandCapability"

However, there is no universal command for all versions of Android. A more reliable way is to count the radio module log. -b radio -d > radio_log.txt. In the resulting file, you need to search for lines containing keywords like"RIL","LTE","Band. Often when starting a device or switching modes, the modem will unload a list of its features. You can also use the adb shell dumpsys telephony utility, which will give a detailed status of the telecom service, including current and supported ranges.

⚠️ Attention: When working with ADB Do not try to enter commands to write (set) in the engineering sections unless you are sure of their purpose, as this may lead to loss of network or the need to flash the device.

Log analysis may seem complicated, but it's the only way to see raw data. If the logs on the network search only mention certain Bands and there are more in the specifications, maybe one of the bands is disabled at the regional lock level or corrupted by software.

Frequency comparison depending on the regional version of the smartphone

One of the main reasons for the frequency confusion is the existence of many regional versions of Xiaomi smartphones. Global version (Global) usually has the widest range of supported frequencies, including the important for Europe and Russia Band 7 and Band 20. Chinese version (China) is often devoid of Band 20, making it almost unsuitable for use in rural areas of Russia and CIS, where this range is the main for 4G.

European (EEA) The Indian and Indian versions may also differ, for example, in India, the Band 20 is less relevant, but the Band 40 is critically important (TD-LTE 2300 MHz, which is used extensively by local operators.When buying a device on the secondary market or ordering from abroad, always check the exact model on the box or in the settings (Settings) → A model with an index ending in"CN", It will probably have a reduced frequency list for our region.

Below is a table of the main LTE bands used in Russia and CIS countries and their importance to the user:

If you own a Chinese version of a smartphone, the absence of the Band 20 means that you are likely to be out of town with only 3G (UMTS) or even 2G (EDGE). Checking the model before buying is the only way to avoid disappointment. Sometimes flashing from the Global ROM to the Chinese version does not add physically missing RF filters, so "software unlocking" frequencies is impossible.

What to do if the frequencies are not the same as the operator

When you find out that your Xiaomi is not friendly with the local carrier frequencies, there are several ways to solve it: the easiest and most effective way is to change the SIM card. Operators often use different frequency sets in the same location. If one operator works primarily on the Band 20, which your phone can't see, another may have a powerful network on Band 3 or Band 7, which your phone supports perfectly.

The second option is to use external antennas, and for houses and cottages, where the signal is weak and is on a frequency that is not available to the phone, there are special antennas. 4G-routers with external antennas. You can insert a SIM card into a router that, with a more powerful modem and antenna, will pick up the signal, and then distribute the Internet to the smartphone over Wi-Fi. This is a workaround that allows you to use the phone in a low-cost area.

It is also worth checking the APN settings. Sometimes, the wrong APN settings prevent the phone from registering on an LTE network, even if the frequencies are the same, resetting the access point settings to factory ones or getting automatic settings from the operator can solve the network invisibility problem.

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Changing the carrier to the one whose frequencies physically support your smartphone often gives you a greater boost in speed than buying a new expensive flagship.

In extreme cases, if the phone is not suitable for your region (for example, a Chinese device without a Band 20 in a remote village), the only solution is to replace the device with a global version or a model with a wider range of supported frequencies.

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