The problem of slow mobile internet on Xiaomi smartphones is familiar to many users, especially in built-up or remote environments, where the indicator shows a confident signal, but pages are loaded for hours, often caused by software restrictions or incorrect network settings, rather than physical damage to the antenna. Owners of Redmi and POCO devices often face the need to force the switch of the radio module modes to achieve better results.
There are several proven ways to improve connectivity without buying additional hardware. Optimizing system parameters and choosing the right frequency range can work wonders even in an unstable reception zone. We will look at both safe methods for ordinary users and advanced settings for those who are willing to experiment.
Before making any major changes, we should rule out trivial causes of failure, such as a crowded cache of the system or an outdated version of the firmware. MIUI and the new HyperOS have their own power management features that can aggressively limit the operation of the communication module in order to save battery power.
Diagnostics of the current state of the network
The first step in the optimization process is to understand exactly what type of network your device is running on at the moment. Often the phone "hits" to overloaded 3G or weak 4G, negating the faster frequencies available in that location.
The easiest way to see the actual speed and type of connection is to activate the display of technical data on the lock screen or in the status bar, which will allow you to monitor the smartphone’s response to your actions to change settings in real time. Signal Level Monitoring (RSSI) gives an objective picture of reception quality, expressed in negative decibels (dBm).
⚠️ Attention: The closer the value RSSI zero, the better the signal. -50 dBm is considered ideal, while -110 dBm and below indicate critically weak reception, where a stable Internet is almost impossible.
To access the advanced network information, you can use a hidden code that opens the test menu. Enter ##4636## in the Phone app. If the menu doesn't open, your shell version may block that access and you'll need to install a third-party diagnostic application. In the window that opens, select Phone Information to see the current network type, signal level and connection status.
Basic network settings in the smartphone menu
The default Android settings on Xiaomi devices may not be optimal for all regions and operators. Often the system automatically selects the "best" type of network, but the selection algorithm is mistaken, preferring the stability of voice communication data rate. Manual switching of the preferred type of network can solve the problem.
Go to Settings. → SIM-maps and mobile networks → Preferred network type: Try changing the value from "Preferred" 4G (LTE)" Only" 4G (LTE)" Or, conversely, allow fallback to be 3G, if 4G The signal is intermittent. LTE Makes the modem ignore the towers 2G and 3G, What's in the areas of insecure reception 4G It can lead to the complete disappearance of the network, but in areas of the boundary signal often gives an increase in speed.
It is also worth checking the settings of the access point (APN). Operators periodically update their network settings, and the old settings may not work properly. SIM-map, then "Access points (APN)". Click the reset button to the default settings or create a new point by entering current data from your operator’s official website.
- 📶 Make sure that in the settings APN protocol IPv4/IPv6, As some operators move to new addressing standards.
- 🔄 Rebooting the communication module through flight mode helps reconnect to a less busy base station.
- 📱 Turn off traffic savings in settings SIM-maps so that the system does not restrict background data transmission.
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If you often move between areas with different coverage, use the "Flight Mode" widget on your desktop for a quick reset of the network with one click.
Using an engineering menu to amplify the signal
The engineering menu is a powerful tool for advanced users to interfere with the radio module at a low level, and this is where you find settings hidden from the average user that directly affect antenna sensitivity and connection priorities. Access to these functions is provided through special USSD-code-enhancing applications.
One key feature is the choice of bands (Bands). Operators use different frequencies for 4G: low (Band 20, 800 MHz) better break through walls but have less speed, and high (Band 3, 7, 2600 MHz) give high speeds but are worse at penetrating obstacles. Blocking weak ranges can make the phone hold on to a faster frequency.
In the ##4636## menu ("Phone Information"), find the "Select Radio" or "Set Preferred Network Type" button. Experiment with options that contain "LTE Only" or "LTE/TD-SCDMA." However, beware: turning on "LTE Only" mode may cause incoming calls to stop coming if your carrier does not support VoLTE.
What to do if the sound is lost when LTE Only is turned on?
| Parameter | Description | Impact on speed |
|---|---|---|
| RSCP / RSRP | Signal power level | The higher (closer to 0), the more stable the connection is. |
| SINR / SNR | Signal/noise ratio | Critical for high speed 4G/5G |
| Band | Frequency range | Higher frequencies (Band 3, 7) are faster than low frequencies |
| PCI | Cell ID | Helps determine which tower is connected to |
Resetting network settings and updating profiles
Errors in network configurations are a common cause of sudden Internet speed drops. Over time, the phone may get stuck on parameters that are no longer relevant to the current location or the updated operator infrastructure.
To do this, go to Settings → Connection & Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Please note that this action will remove saved passwords from Wi-Fi networks to other Bluetooth devices, but will not affect your personal files or applications. After the restart, the phone will again request settings from the operator.
Another important aspect is the PRL (Preferred Roaming List) and operator profile updates. On some global versions of Xiaomi, these lists may be outdated. Check for system updates in About Phone → MIUI, as security patches and systems often contain updated carrier databases.
☑️ Checklist before network reset
Influence of covers and external factors
The physical impact on signal quality should not be underestimated. The antennas in modern Xiaomi smartphones are located around the perimeter of the body, often in the upper and lower parts of the rear panel or in the side frames. Using cases with metal inserts, magnetic fasteners or simply very thick silicone can shield the signal, reducing the reception efficiency by 30-50%.
Check your accessory: if it contains metal or has a metallized coating inside, try removing it and measuring the Internet speed again. Magnetic rings for mounting the phone in the car are also powerful sources of interference for the antenna module.
And also, the speed is affected by the temperature of the device, because when the processor and modem overheat, the system automatically lowers the clock speed and the transmitter power to protect the components, and if your phone is hot, the Internet speed can drop even at full signal levels.
⚠️ Warning: Do not use your phone to download large files while charging in a thick case.The combination of heat from the processor, charger and poor heat transfer due to the case will lead to trottling and a drop in network speed.
Hidden codes and third-party applications
For users who don’t have enough standard tools, there are a number of apps from Google Play, such as Network Cell Info Lite or Signal Booster. These programs are not a “magic pill”, but they provide detailed statistics and help you find a place in the house with the best signal, which is especially true for modems or when using your phone as a router.
Some enthusiasts use ADB (Android Debug Bridge) commands to change hidden radio parameters, such as carrier aggregation, which allows multiple frequency channels to be combined to increase bandwidth. However, such manipulations require a connection to a PC and knowledge of specific commands for your processor (Snapdragon, MediaTek, Exynos).
An example of a command to check aggregation status through ADB can look complicated, but for the average user, it is enough to know that such a possibility exists. A safer way is to use applications to clean the DNS cache, which sometimes speeds up the opening of pages with a good signal but slow server response.
- 🚀 Boost apps often simply reboot the network stack, which can be done manually through flight mode.
- 🔧 Teams. ADB Requires the included debugging mode for USB and careful introductory.
- 📡 External antennas for smartphones exist, but require specific connectors or NFC-reinforcement stickers.
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The most effective way to amplify the signal is to find the point in the room with the best RSRP score and lock the phone in this position, eliminating physical obstacles.