Xiaomi smartphone owners often have to check support for specific frequency bands, especially when buying a device from China or planning trips abroad. Understanding which Band (frequency bands) your Xiaomi, Redmi or POCO supports directly affects the quality of voice communication and mobile Internet speed. Without this information, it is difficult to predict whether a 4G phone will catch in a remote area or abroad.
There are several ways to get this technical information, from simple third-party applications to in-depth analysis through the engineering menu, and we'll look at each method in detail so you can choose the most convenient one. It's important to understand the difference between hardware support and the software constraints of the region.
In this article, we'll look at how to interpret the data and why it's critical to connection stability, learn how to read the modem specifications and avoid network problems, and start with the simplest and most affordable verification methods.
Using applications to check frequencies
The easiest and safest way to find out the frequencies you support is to install a dedicated app from the Google Play Store, programs like Cellular-Z or Network Cell Info Lite read data directly from the modem and output it in an understandable way, and you don't need root rights or a computer connection.
Once you install the app, you need to give it permission to access your location and phone. This is a mandatory requirement for Android to work with data about cell towers. SIM-map.
⚠️ Note: Some apps may only show the currently active Band, rather than a complete list of supported Bands.
In the interface, you'll see a list of frequencies divided by communication generations: 2G (GSM), 3G (WCDMA), 4G (LTE) and 5G (NR). Usually supported bands are highlighted in green or blue, and inaccessible bands are gray. Pay attention to the labeling "Supported" or "Available".
- 📱 Cellular-Z is one of the most popular applications with a detailed description of frequencies.
- 📡 Network Cell Info Lite – a convenient widget and detail for each base station.
- 📶 LTE Discovery – a professional tool for analyzing coverage and frequencies.
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If the app shows “N/A” in the frequency graph, try switching network mode in your phone settings to 4G/LTE Only to activate the module.
Checking through the Engineering Menu (CIT)
The engineering menu is a hidden section in the MIUI and HyperOS shell that is designed to test hardware, accessed through a standard "bell ringer" using a special code, and this method does not require the installation of additional software.
To enter, dial the combination ##6484## or #4636##. If the first code opens the CIT menu (where there are many hardware tests), the second immediately leads to the "Phone Information" section. In some regions, the codes may differ or be blocked by the operator.
In the “Phone Information” menu, select yours. SIM-map (SIM 1 SIM 2) Then click on the "Set Preferred Network Type" section, which will open a drop-down list containing technical indications of the modes of operation.
Mode names often contain numbers that denote Band. NR_NSA_NR or LTE_Only Support information may be withheld, but a more detailed list of frequencies is sometimes available under the sub-menument "Information of the SIM-status" or through hidden modem tests in CIT.
What do I do if the codes don't work?
Analysis through ADB and Command Prompt
For advanced users who need comprehensive data, the method using the ADB (Android Debug Bridge. This way you can get raw data from the modem that's not hidden by the shell interface. You'll need a computer and a computer. USB-cable.
First, you need to activate USB debugging. Go to Settings → About Phone and quickly click on MIUI Version 7 times. Then, in the advanced settings, turn on USB Debugging. Connect your smartphone to your PC and confirm the request on your phone screen.
On your computer, open the command line in the ADB folder and type a command to get a list of supported LTE bands. The system will give a long list of digits corresponding to the Band numbers.
adb shell service call phone 110 i32 0The result of the command will be represented as a set of numbers. Each number corresponds to a certain frequency range. For example, the number 3 stands for Band 3 (1800 MHz), and 7 is Band 7 (2600 MHz), and you can find the decoding in the 3GPP specifications.
☑️ Preparation for ADB diagnostics
Official specifications and global versions
The most reliable, though not always operational, source is the manufacturer’s official website. Xiaomi publishes full specifications for each model in the Characteristics section. However, there is an important caveat: global and Chinese versions of the same smartphone may differ in the frequency set.
Chinese versions are often devoid of some Bands popular in Europe (such as Band 20), but may have an expanded list for Asian operators. Global Version is adapted to international standards.
| Type of version | Region | Features of the Band | Firmware |
|---|---|---|---|
| CN (China) | China | Full set for Asia, may not be B20 | Chinese (CN) |
| Global | International | Optimized for EU/World (B1, B3, B7, B20) | Global (Global) |
| EEA | Europe | Strict compliance with EU standards | European (EEA) |
| RU | Russia/CIS | Support for all frequencies of local operators | Global/Local |
Note the model marking at the end of the name, for example, the M2004J19C is the global version, and the M2004J19G may be different. Checking the exact model number on the Xiaomi website will help you avoid errors when choosing a device.
Differences between the Communication Generation and Band
Understanding the difference between the communication generations (2G, 3G, 4G, 5G) and the specific Bands within them is key to fine-tuning. Each generation uses its own set of frequencies, and not supporting one of them can critically slow down speeds.
In 4G (LTE) networks, the most important in Europe and Russia are Band 3 (1800 MHz), Band 7 (2600 MHz) and Band 20 (800 MHz). Band 20 is especially important for coverage in rural areas and inside buildings, as low frequency penetrates walls better.
With the advent of 5G, things have become more complicated, with FR1 (Sub-6GHz) and FR2 (mmWave) bands emerging, and most mid- and low-end Xiaomi smartphones supporting only FR1. Flagships can support high-frequency bands that are rarely used in the mainstream.
- 🚀 5G NR n1, n3, n28 — main ranges 5G worldly.
- 🏙️ 5G mmWave – ultra-high speeds but short range.
- 🏠 LTE Band 20 – the king of signal penetration in the premises.
If your phone supports 5G, but in your region the carrier uses the n78 band and the phone doesn't "see" it, there won't be a fifth-generation connection. Always check the list of supported phone frequencies against the carrier frequencies.
The impact of flashing on the modem
Many users buy Chinese versions of Xiaomi and reflash them to the global version (Global ROM) to get Russian language and Google services. Here lies an important technical point: the software firmware does not change the hardware of the modem.
If the phone’s hardware didn’t initially support Band 20, installing global firmware won’t make it work, and in some cases, flashing it can cause the communication module to malfunction if the regional settings (Region Code) don’t match the hardware.
⚠️ Attention: Flashing CN-version ROM It doesn't add new frequencies. It's software-impossible to circumvent the hardware constraints of the modem.
In addition, there are “European” versions of global firmware that can software-limit certain frequencies or functions (such as conversation recordings or Mi Pay) even if hardware allows it, and choosing the right version of software is as important as choosing the smartphone itself.
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Hardware frequency support is determined by the modem and antennas stitched in the factory. Software updates cannot extend the physical range of received frequencies.