How to improve mobile network on Xiaomi: from settings to engineering menu

Owners of Xiaomi, Redmi and POCO smartphones often face a situation where the device shows the full signal level, but the Internet is unstable or the connection is cut off at the most inopportune moment. This is especially true in regions with dense buildings or remote areas where every decibel of the signal is worth a lot of gold. The problem may lie not only in the physical location of the operator’s base stations, but also in the modem’s software algorithms that are not always optimally configured out of the box.

There are a number of effective methods to reanimate reception and speed up data transfer without buying expensive equipment. Deep system settings, changing priority frequencies and correctly resetting network profiles can work wonders even on budget models. We will look at both safe methods through the standard menu and more advanced ways for advanced users.

It's important to understand that the hardware limitations of the antenna system are not going anywhere, but the right software calibration will help you to get the most out of the existing potential. MIUI and the new HyperOS have hidden functionality that most people don't even know. Let's figure out how to get your smartphone to catch the network where other devices are already giving up.

Diagnostics of the current state of the network

Before making configuration changes, you need to accurately determine the current connection parameters. Standard sticks in the corner of the screen are often misleading, since they show the average value of the signal quality, rather than its actual power in decibels. For accurate data, you can use the built-in engineering menu or third-party monitoring utilities.

The most accurate way is to look at RSSI (Received Signal Strength Indicator) and SINR (Signal-to-Interference-plus-Noise Ratio) values. The first parameter shows the signal power in dBm (dBm), where values closer to zero (for example, -70 dBm) are considered excellent, and values below -110 dBm are critically bad. The second parameter reflects the signal quality relative to noise: the higher it, the more stable connection and the higher speed.

For quick checks, you can use hidden code ##4636##, which opens the test menu. Here, under Phone Information, you can see all the technical details of the real-time connection. Pay attention to the type of network (LTE, H+, 5G) and the frequency at which the device is currently operating.

⚠️ Attention: dBm values are always negative. The smaller the number module (closer to zero), the better the signal, -85 dBm is better than -105 dBm.

Compare the data with the reference values in the table below to see how critical your situation is:

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If the SINR value drops below 0 dB, the internet may run slower than 3G due to the constant retransmission of data packets.

Basic settings and resetting of APN

Often the cause of low speeds are incorrect access points (APN), which may have been lost after a firmware update or change SIM-Operators periodically change gateway settings, and automatic setup does not always work correctly on Xiaomi devices. Manual verification and creation of a new access point is the first step to solving the problem.

To do this, go to the Settings menu. → SIM-maps and mobile networks → Choose. SIM-map → Access points (APN). In the list that opens, click the Reset button or create a new point by entering current data from your operator's official website. Remember to select it and restart the device after you create it.

Also worth paying attention to network modes: In some cases, an automatic choice between 2G/3G/4G leads to the phone "clinging" to a weak 4G instead of a 3G stable, or vice versa. Forced switching from the preferred network type menu can give a temporary increase in stability.

Remember that the enabled Data Savings or Traffic Limit mode in MIUI settings can artificially limit the background activity of applications, creating the illusion of a bad network.

Using an engineering menu to select ranges

One of the most powerful tools in the Android owner’s arsenal is the engineering menu, which allows you to control the radio module at a low level. On Xiaomi smartphones, it is often hidden or limited, but access to the selection of frequency bands (Band Lock) usually remains open.

Enter the testing menu using the code ##4636## or ##3646633## (code may vary depending on the version of MIUI).Look for the Phone Information or BandMode section. Here you will see a list of standards (GSM, UMTS, LTE) and checkboxes for specific frequency bands.

Changing priority bands is especially important if you're at the edge of coverage. The phone can be constantly rushing between towers of different frequencies, losing data packets. Fixing on one frequency (for example, only the Band 20 for the summer or only the Band 7 for the city center) stabilizes the connection.

⚠️ Warning: Don't turn off all bands at once! If you take off all-band support, the communication module will stop working and you'll have to take out SIM-card or make a complete reset to return the connection.

After changing the settings, be sure to press the Set or Apply button. The changes take effect immediately, but for guaranteed application, it is recommended to turn on and off flight mode.

Resetting network settings and updating profiles

The accumulation of system debris and conflicting configuration files can degrade connection quality over time. HyperOS and newer versions of MIUI have a full network reset feature that returns all modem, Wi-Fi and Bluetooth settings to factory values without affecting user personal data.

This can be done through the Settings path → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. This procedure is especially useful after changing the carrier or moving to another region where different repeater settings are used.

Also, check for updates to the Carrier Services system component and basic operator settings, sometimes new configuration packages that are not automatically installed due to software errors.

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Regularly resetting network settings (every 3-6 months) helps (clear) the cache of connections and eliminates “sticking” on weak towers.

Once reset, the phone will re-register online, following a full handshake with the base station, often allowing it to connect to a less-loaded cell or a more modern communication standard that was previously ignored.

Influence of covers and physical factors

The antennas in modern Xiaomi smartphones are often embedded in the frame of the case or located at the top and bottom of the back cover. Metal elements in the design of the case, magnetic holders or simply too thick material can shield the signal, reducing its level by 10-15 dB.

If you want to take off your cover and check the signal level, you might want to consider replacing the accessory with a more "transparent" one for radio waves, and also pay attention to the position of your hands, because in horizontal mode (when playing or watching video), your palms can overlap antenna lines.

Even a simple change in position helps in very weak signal conditions, so lifting the device higher or turning it face to the window can give you the necessary increase in signal strength to establish a connection, and in extreme cases, you can use homemade foil reflectors, although this is more of a temporary solution.

⚠️ Attention: Use of external antennas with foil gluing to the body without coordination of impedance can lead to overheating and failure of the antenna module power amplifier.

Also check integrity SIM-Older cards carved with nano-SIM scissors may have damaged contacts or mismatched thickness, leading to poor contact and periodic communication breaks. SIM-cards for a new in the cabin operator often solves the problem of unstable reception.

Advanced Methods: ADB and Hidden Commands

For users who are not afraid of the command line, there are ADB (Android Debug Bridge) debugging tools that can force you to reset network preferences or change the parameters of the radio module that are not available through the standard interface, which requires connecting to a PC and installing drivers.

One useful command is to reset the network preferences, which is similar to Forget Networks, but on a deeper level.

adb shell svc data setpreferred 0

You can also try to force the network mode to switch over ADB if the standard menu is blocked:

adb shell settings put global preferred_network_mode 9

(Where 9 corresponds to LTE/TD-SCDMA/GSM mode, the codes may differ for different Snapdragon or MediaTek processors.)

Using these methods requires caution. Incorrect mode selection can lead to the fact that the phone will no longer see the network at all, and you will have to do a complete reset (Wipe Data) to restore factory settings.

Frequently Asked Questions (FAQ)