How to check the network on your Xiaomi phone: the complete guide

Modern Xiaomi and Redmi smartphones are equipped with advanced communication modules, but even they sometimes face interruptions in mobile Internet or voice communication. The user may notice that the page load speed has dropped, calls are disrupted, or the indicator shows 4G where LTE used to work. In such situations, you need to conduct diagnostics to understand whether the problem lies in the hardware, software failure or operator actions.

Connection quality testing is not just looking at the number of sticks in the corner of the screen; the real signal level is often hidden behind beautiful graphics of the interface; for accurate diagnostics, owners of MIUI or HyperOS devices have access to special engineering menus and system utilities that provide technical information in digital format, which allows you to objectively assess the situation.

In this article, we will look at all the ways of checking available, from standard settings to hidden codes that not everyone knows. RSRP and SINR, check out SIM-Competent diagnostics will help you solve 90% of communication problems without going to the service center.

Using an engineering menu for accurate diagnosis

The most reliable way to get detailed information about the state of the network is to log into the engineering menu through special devices. USSD-Unlike the standard settings menu, here the data is presented in raw form, without rounding and simplifications. For Xiaomi devices, the main code is ##4636.

In the list that opens, select Phone Information, which shows the current status of the connection, the type of network, and most importantly, the signal technical parameters. Pay attention to the Signal strength field. If it says -95 dBm or higher (closer to zero, for example -60), the signal is excellent. The values below -110 dBm indicate a critically weak reception.

⚠️ Attention: The engineering menu also has a "Turn off radio" function.Do not press this button unless absolutely necessary, as the phone will completely lose communication with the towers, and it may be necessary to restart the device to restore operation.

In addition, you can force the network mode to switch in this section. If your phone is constantly trying to catch unstable 4G, although it is confidently holding 3G, you can temporarily limit the connection, which is useful for saving battery power in areas of uncertain reception.

Signal Level Analysis: dBm and ASU

Understanding the units of signal is key to proper diagnosis. In the technical menu, you'll see two basic indicators: dBm (decibels per milliwatt) and ASU (Arbitrary Strength Unit). dBm is the absolute signal power, and here the rule is: the smaller the negative number module, the better the connection. That is, -50 dBm is better than -100 dBm.

ASU is a relative value used in GSM and UMTS networks. For 4G (LTE) networks, it is calculated using the formula, but it is easier to navigate the correspondence table. If ASU shows 0, it means a complete dead signal or no registration on the network. Values above 20-25 ASU in the city are considered the norm.

Note the SINR (Signal-to-Interference-plus-Noise Ratio) parameter, which shows the ratio of signal to noise. If you have a full signal level (e.g. -70 dBm) but the SINR is negative or close to zero, the Internet will run slowly, and this often happens in crowded areas where many towers create mutual interference.

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The ideal indicator for a stable Internet is considered to be a level above -90 dBm and SINR above 10-15 dB. If dBm is good and the speed is low, then the problem is in the tower overload or APN settings.

Verification SIM-maps and network status

Often the problem lies not in the phone, but in the phone itself. SIM-Xiaomi smartphones have a built-in tool for checking the status SIM. Go to Settings. → The phone. → All specs → SIM-map and network (the path may vary slightly depending on the version) MIUI). Here you can see. IMEI, network status and type SIM.

If the phone says no SIM-Maps" or "wrong format," try the following steps. First, wipe the contacts. SIM-Soft dry cloth, fat and oxidation can disrupt data transmission, and second, check if the map is properly installed in the tray, even microscopic distortion leads to loss of contact.

• 📱 Checking in another device: Insert SIM-If the problem persists, contact the operator's office to change the card.
• 🔄 Slot change: If you have a dual-sim phone, move the card to another slot.Sometimes one of the slots may have a defect in soldering of the antenna module.
• 🛠️ Network Settings Reset: In the settings menu, find Recovery and Reset and select Reset Wi-Fi, Mobile and Bluetooth settings.This will delete saved passwords, but often resolve software conflicts.

It is also important to check if it is blocked. SIM-card by the operator due to expiration or lack of activity. Call support or check your account via Wi-Fi. Sometimes operators carry out scheduled work, which can be found on their official website.

Testing the speed and stability of the Internet connection

To test the real speed of mobile Internet, visual evaluation of page loading is not enough. Use specialized applications or web services such as Speedtest by Ookla or Fast.com. Run the test at different times of the day as the load on the operator's network varies.

Pay attention not only to download speed (Download), but also to ping (Ping) and jitter (Jitter). Ping shows server response delay, a critical parameter for online games and video calls. Jitter displays the stability of this ping. High jitter means that the connection "jumps", which leads to dissynchronization in games and voice interruptions.

If the test shows a slow speed, try changing the access point (APN). In the mobile network settings (Settings) → SIM-maps and mobile networks → Access points (APN)) You can create a new point with the parameters recommended by your operator, and sometimes the automatic settings become outdated or conflict with the current loading of the tower.

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Before measuring the speed, be sure to turn off Wi-Fi and close the background apps that may be consuming traffic (cloud updates, game downloads) to get honest results.

Hidden codes and tests of Xiaomi equipment

In addition to the engineering menu, the MIUI includes a hidden CIT (Customer Integration Test) test menu that allows you to check the operation of all the phone modules, including antennas. To enter, dial the code ##6484## or go through the service menu.

You can run automatic testing of all components in this menu. SIM Card Test and Radio. The system will check if the module sees the communication SIM-If the test is not passed, the system will issue an error, indicating a hardware malfunction of the antenna or modem.

There are also codes to check specific versions of components, such as the #225## code will show information about Google's event calendar, but the *#06# code is more useful for quickly checking IMEI. Make sure the IMEI on the screen matches the number on the box and under the battery (if it's removable).

⚠️ Note: Do not change the settings in the menu CIT, If you're not sure what you're doing, resetting the calibration of the sensors or the radio module can cause the phone to malfunction, which is difficult to fix software.

Using these tools allows you to weed out software glitches. CIT-The communication test is successful, but in ordinary life the network disappears, the problem is most likely in the application conflict or energy saving settings.

Resolving Typical Connection Problems

If the diagnostics show problems but no hardware malfunctions, try a comprehensive approach. Often the culprit is a power saving mode that aggressively shuts down the radio module. Go to Settings → Battery and make sure that the system communication processes are not subject to strict restrictions.

Another common reason is the accumulated cache of Google Play system services or the interface itself. Clearing the cache through the app menu can refresh network settings, and it is also worth checking whether Flight mode is turned on by accident or through automation (scenarios).

• 📡 Change the network standard: In the mobile network settings, try switching mode from Preferred LTE» on «3G/2G». If the connection stabilizes, then your area is covered. 4G weak-burdened.
• 🔧 Factory reset: Last resort. Make sure to back up your data before you do that.
• 🏢 Contact the service: If after resetting and inspection SIM-cards in other phones the problem remains, the likely failure of the antenna module or plume.

Remember, the metal cases or the magnetic holders in the car can shield the signal. Take off the case and check the signal level again. Sometimes the solution lies on the surface.

Frequently Asked Questions (FAQ)