LTE on Android Xiaomi: what it is, how to turn on and adjust speed

A modern smartphone is impossible to imagine without high-speed access to the global network, and owners of Xiaomi, Redmi or POCO devices often encounter the acronym LTE in the status bar. For many users, this icon has become synonymous with fast Internet, but few people think about what lies behind these three letters and what technical capabilities they open. Long Term Evolution is a wireless data standard, which is often mistakenly called 4G, although technically it is the precursor to a full-fledged fourth generation of communication, although in everyday life the difference is almost imperceptible.

Owners of Chinese versions of smartphones or users who have changed their region may notice that their device LTE is unstable or completely absent, which requires interference with system settings. Understanding the principles of this technology allows you not only to effectively manage traffic, but also to solve common problems with coverage in low signal areas. In this article, we will discuss in detail the network architecture, methods of forced switching of modes and optimization methods for devices based on the MIUI and HyperOS shell.

Knowing the technical details will help you diagnose mobile operator problems yourself and eliminate software failures that often masquerade as hardware faults of the communication module. We will look at how to correctly interpret speed indicators and why it is advisable in some cases to manually switch to older but stable communication standards. A critical point is to support a specific modem of your smartphone frequency ranges, since even the presence of an LTE icon does not guarantee high speed if the spectrums mismatch.

Technical features and differences from 3G and 4G

LTE was designed as a bridge between the aging 3G standard and the full 4G, offering significantly higher data rates and lower latency. Unlike its predecessors, which used circuit switching, LTE is packet-based, allowing for more efficient use of available bandwidth. This means that your Xiaomi is able to process large amounts of information, which is especially noticeable when streaming high-resolution video or online games.

The main difference is 3G is the architecture of the network: LTE flat-figure IP-This is a structure that minimizes the number of nodes that the signal passes through, reducing ping, which for users is expressed in the instant loading of pages and the absence of characteristic pauses when buffering content. 4G (IMT-Advanced requires even higher speeds. LTE It is only available in its advanced version of LTE-Advanced.

⚠️ Attention: Availability of a badge 4G In status bars, it doesn't always mean fourth-generation work, and operators often label LTE-Advanced networks as 4G+, while LTE It can be simply displayed as 4G stay LTE, Depending on the Xiaomi firmware settings.

It is important to note the difference in frequency bands used, as different regions and operators use different frequency bands to deploy networks. Xiaomi smartphones designed for the global market usually support a wide range of frequencies, while Chinese versions may be limited to specific bands popular in Asia.This can lead to situations where the phone sees the network but cannot connect to it at maximum speed due to hardware incompatibility.

Data transfer speed in networks LTE theoretically can be achieved 300 Mbps_download_ before 50 Mbps _upload_, But in practice, these numbers depend on the loading of the tower and the distance to it. 3G rarely exceed the rates of 42 Mbps, which makes the transition to LTE The modern Snapdragon and MediaTek processors used in Xiaomi phones are equipped with powerful modems that can aggregate multiple frequency channels to increase bandwidth.

Why Xiaomi is not running LTE or 4G is missing

One of the most common problems Xiaomi owners have is the sudden disappearance of the LTE icon or the inability to switch to this mode, even if there is coverage from the operator. Often the cause lies in software failures, incorrect settings of the access point or temporary problems on the cell tower side. The first step in diagnosis should always be to check the balance and tariff plan, since some operators automatically turn off high-speed access when the packet is exhausted.

The second reason is the incorrect work. SIM-cards, especially if they were hand-carved from a larger format card or have physical damage to contacts. SIM-Cards issued several years ago may not support the necessary encryption protocols or frequency bands required for stable operation. LTE in the Redmi networks and POCO. In such cases, replacing the card with a new one from the operator often solves the problem instantly.

Also worth considering is the impact of MIUI or HyperOS updates, which can sometimes change the modem's regional settings. After a major firmware update, the user may find that the phone has stopped seeing LTE networks, which requires manual intervention in the engineering menu or resetting the network settings. In some cases, the problem is hardware-based, for example, if the antenna module is damaged after a drop or moisture.

Note the power saving settings that Xiaomi phones can be aggressively set up. Energy saving mode often force the device to 3G or 2G mode to save battery power, ignoring the user's high-speed needs. Disabling optimization for system processes responsible for communication can restore the normal operation of the module.

How to enable and configure LTE on Xiaomi and Redmi

To activate the high-speed mode, you need to go to the device settings menu by selecting the Settings section. → SIM-Maps and mobile networks. You should choose active networks. SIM-map and click on the network type, where in the list that opens, select the preferred option, for example, Preferred LTE. If the standard path does not give a result or the item is missing, you can use the hidden engineering menu, available through a set of special code in the Phone application».

Enter ##4636## in the dialer to get to the test menu where you want to select Phone Information. From the list that opens, find the Set Preferred Network Type drop-down menu and select the option that contains LTE, such as LTE/TD-SCDMA/GSM (auto connect). Once you select the mode, the phone may briefly lose the network, after which it must register in the LTE coverage area at the maximum available speed.

##4636##


Menu: Phone Information




Option: Set Preferred Network Type




Select: LTE/TD-SCDMA/GSM (auto connect)

The second card will only work in 2G or 3G mode for voice calls, which is a technical limitation of many modems. If you are critically important to LTE on the second SIM, you will have to switch priority in the settings manually each time.

After making changes to the settings, it is recommended to reboot the device so that the communication module is fully reconnected to the network with new parameters. If the LTE icon appears but the Internet is not working, check the APN access point settings, which must meet your operator's requirements. Incorrect APN settings are a common reason when the network is there and data transfers do not occur.

Frequency range comparison and operator support

LTE performance is directly dependent on how much the frequency bands supported by your Xiaomi coincide with the ranges used by the operator in your region. In Russia and CIS countries, the most common bands are Band 3 (1800 MHz), Band 7 (2600 MHz) and Band 20 (800 MHz), each of which has its own characteristics of coverage and penetrating ability. Redmi and POCO smartphones usually support a wide range of frequencies, but budget models can have limitations.

Band 20 (800 MHz) is critical for LTE in rural areas and in thick-walled buildings, as low frequencies are better at avoiding obstacles. If your phone doesn’t support this range, it can switch to 3G or EDGE in remote locations, even if the operator formally claims 4G coverage. Global versions of Xiaomi phones almost always include Band 20 support, while Chinese versions may lose it.

You can check the support of specific frequencies with your phone model on specialized sites such as Kimovil or FrequencyCheck by entering the exact name of the model. This is especially true when buying a device at foreign sites, where the seller may not specify the region of the version. The lack of support for key frequencies of your operator will make buying an expensive flagship meaningless in terms of communication quality.

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Use Network Cell Info Lite to see the exact cell number and frequency your phone is connected to in real time, which will help you understand what range you are working on and whether there is a more powerful tower nearby that supports the right Band.

Optimizing speed and eliminating interference

Even with a stable LTE signal, the internet speed on Xiaomi can be low due to background processes that actively consume traffic. Check the list of applications in Settings → Connection and Sharing → Traffic to identify hidden consumers, such as automatic app updates or synchronization of cloud services. Limiting background activity for unnecessary programs can significantly free up the channel for your current tasks.

Another factor that affects speed is a crowded DNS cache or incorrect network settings accumulated over time. Resetting network settings to factory values allows you to clear all temporary configuration files and re-register on the network with clean options. To do this, go to Settings → Connection and Sharing → Reset Wi-Fi, cellular networks and Bluetooth.

⚠️ Note: Resetting network settings will remove all stored Wi-Fi passwords and associated Bluetooth devices. Make sure you remember passwords from important wireless networks before performing this operation.

In some cases, change helps. DNS-servers to a faster one, such as Google (8.8.8.8) or Cloudflare (1.1.1.1). APN, adding new values to the appropriate fields, which often speeds up server response and loading of heavy pages. DNS It does not increase the physical bandwidth of the channel, but only optimizes the routing of requests.

If you are in an unstable reception zone, try changing the position of the phone or approaching closer to the window, as modern glass materials and fittings in the walls can shield the signal. It is also worth removing the case if it contains metal elements or magnets that can interfere with Xiaomi antennas located around the perimeter of the case.

Impact of firmware and regional settings

Smartphone software plays a key role in managing the communication module, and different versions of MIUI firmware can behave differently. Global ROMs usually have the most versatile modem settings adapted for operators in different countries, while Chinese versions (China ROM) can be sharpened for local networks. When flashing the device, it is important to take this nuance into account so as not to lose support for the necessary LTE frequencies.

Owners of devices with an unlocked bootloader and custom firmware installed may experience modem drivers problems if they don't match the hardware. Using the wrong radio files (RADIO) can cause the phone to stop seeing 4G networks or run unstable. Always use official firmware images or proven builds from developers that specify LTE support for your model.

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The region in the phone settings (Settings → Additional settings → Region) affects the list of available frequencies and the operation of some system applications, but does not change the hardware support for the ranges by the modem.

Automatic system updates can sometimes lead to conflicts in network configuration files, especially if the update was interrupted or made with errors. In such cases, a full Hard Reset after the update helps, allowing the system to recreate all the necessary configuration files from scratch.

Some users have noted that after upgrading to new versions of HyperOS, switching algorithms between towers become more aggressive, which can lead to frequent reconnections, in which cases, fixing the phone on a certain type of network through the engineering menu described above helps, which prevents constant jumps between 3G and LTE in border areas of coverage.

Security and Future of LTE Technology

With the development of LTE networks, the security requirements of transmitted data are growing, as the risks of interception of information in open networks become more urgent. The encryption protocols used in LTE are much more reliable than those used in 2G and 3G, but it is impossible to completely eliminate the risk of hacking. Xiaomi users are recommended to use additional security tools such as VPNs, especially when connecting to public Wi-Fi or when transferring sensitive information.

LTE technology continues to evolve, and LTE-Advanced Pro has already achieved wired Internet speeds, blurring the lines between mobile and fixed. The future lies in carrier aggregation and the use of MIMO technologies that allow multiple data streams to be transmitted simultaneously, increasing the overall channel capacity. Xiaomi mid- and high-end smartphones already support these technologies, providing the user with a margin of performance for years to come.

⚠️ Warning: Do not install questionable Internet accelerator applications from unverified sources. They cannot physically increase the speed limited by the operator, but can access your data or introduce advertising.

Understanding how LTE works on your device gives you control over the quality of communication and allows you to make the most of your smartphone. Regular monitoring of settings and knowledge of the basic principles of network operation will help avoid many common problems and ensure stable access to information anywhere in the world. Technology continues to evolve, and Xiaomi devices remain among the leaders in supporting new communication standards.