The problem of unstable communication on Xiaomi smartphones is familiar to many users: missing calls, slow Internet and constant jumps in the network indicator annoy at the most inopportune moment. Often the reason lies not in hardware failure, but in software failures or incorrect settings of the radio module, which are easy to fix yourself. Before carrying the device to the service center, it is worth trying a number of software methods that in most cases return a confident reception.
Modern gadgets are equipped with complex antenna systems, but aluminum housings or tight protective cases can shield the signal. Also, the quality of communication is affected by operator settings, which sometimes get lost after updating the MIUI firmware. In this article, we will discuss in detail how to amplify the signal of the Xiaomi phone using hidden system functions and the correct configuration of network parameters.
Diagnostics of the current state of the network
The first step before any action to improve communication should be a thorough diagnosis, to understand whether the problem is hardware or software, and to assess the signal level in different locations, using an engineering menu that provides detailed information about the operation of the radio module.
To get into the testing menu, open the Phone app and dial the combination ##4636##. If the code didn't work, you can try ##3646633## to access Engineer Mode. From the menu that opens, select Phone Information where you will see the current signal strength in dBm (dBm).
Notice the numerical values: a score of -50 to -80 dBm is considered excellent, a score of -80 to -90 dBm is good, and anything below -100 dBm indicates a very weak signal. If values drop sharply when driving or in certain rooms, the problem may be the carrier's coverage, not the smartphone.
⚠️ Note: In the engineering menu, do not change the values in fields whose purpose you do not know. Resetting the wrong parameters can lead to complete loss of communication and require flashing the device.
What do LTE parameters mean?
Basic settings and module reboot
The easiest and often ignored way to solve the problem is to force the network module to restart, and during prolonged operation in the background, errors can accumulate that prevent the phone from correctly switching between the operator's base stations.
To perform this procedure, you do not need to completely turn off the smartphone. Just go to the settings and select a point «SIM-Maps and mobile networks. You need to find a switch for your mobile phone. SIM-maps, turn it off, wait, wait. 10-15 And then you turn it back on. This action triggers re-registration.
If a simple reboot didn't work, it's worth checking if In-Airline mode is activated. Sometimes the system sticks in this mode even after it's turned off. Turn on the flight mode for 30 seconds, then turn it off. This causes the radio module to reset all current connections and look for the nearest tower from scratch.
☑️ Quick checklist of diagnostics
You also have to look at the type of network. 4G It can be unstable and the phone will constantly try to catch a weak signal. LTE, flat-out 3G. Settings menu → SIM-maps and mobile networks → The preferred network type can be selected by the standard 3G (preferably 2G/3G, If you care about the quality of your voice than the speed of the Internet.
Resetting and configuring APN access points
A common cause of slow internet at full signal levels is incorrect settings of APN access points. Operators periodically change the settings of their networks, and old settings stored in the phone’s memory can conflict with current hardware requirements.
To correct the situation, go on the Settings path. → SIM-maps and mobile networks → Choice SIM-map → Access points (APN). In the list that opens, click Reset (usually at the bottom of the screen or in a three-dot menu) and this will return factory settings to your operator.
If automatic reset didn't work, you can create a new hotspot manually, you need data from your carrier's official website, and it's important to type in the APN field correctly, because that's what identifies the gateway in the provider's network, and after you save the new hotspot, make sure to tick it and reboot the device.
| Parameter | Importance for MTS | Meaning for Beeline | Meaning for Megafon |
|---|---|---|---|
| Name. | MTS Internet | Beeline Internet | Megafon |
| APN | internet.mts.ru | internet.beeline.ru | |
| User name | mts | beeline | gdata |
| Password. | mts | beeline | gdata |
⚠️ Attention: When manually entering data APN Keep the letter register in check, and avoid spaces, and a single character error can make the mobile Internet completely unusable.
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Save screenshots of the APN factory settings before changing them, which will quickly restore the Internet to work if the new settings are incorrect.
Using an engineering menu to amplify the signal
For advanced users who want to get the most performance from their Xiaomi Redmi or Mi, deep editing of radio frequency settings is available. Through the engineering menu, you can prevent the phone from using certain frequency ranges that are loaded or have poor coverage in your area.
Log in to the engineering menu with code ##3646633## and go to the Telephony tab. Select BandMode or Preferred Ranges. Here you will see lists for GSM, WCDMA and LTE. By ticking off rare or weak frequencies, you make the modem ignore them and cling to more stable towers.
For example, if your base station is running at 1800 MHz in your area, and your phone is constantly trying to catch 900 MHz from a distant tower, the signal will be weak. Experimentally, you can determine the optimal set of frequencies. However, remember that improper settings can lead to complete loss of the network.
Another useful feature is the transmission power setting, and some versions of the engineering menu (the Tx Power section) show the current transmission power, and if the phone is constantly running at maximum power, it can indicate a poor signal and quickly land the battery.
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Band Mode is the most effective software method for combating a “floating” signal in areas of uncertain reception, but it requires caution.
Hardware factors and external conditions
Remember that the software settings are powerless against physical obstacles: antennas in Xiaomi smartphones are located around the perimeter of the case, and their work can be disrupted by metal objects, thick walls, or even the user’s hand in a certain grip.
One of the common causes of signal degradation is magnetic cases or metal cases. Metal shields radio waves, creating a "dead zone" around the antenna. If you notice that without the cover, the signal is great, and the case disappears, the problem is solved by replacing the accessory with a model of silicone or plastic.
The battery charge is also affected by communication quality. At low charge levels (less than 15-20%), some phone models can artificially reduce the transmitter power to save energy, leading to a poor reception. Charge the device up to 50% and check the signal level again.
In rooms with thick concrete walls or basements, the signal can be shielded by reinforcements, in which case it helps to move closer to the window or use the Wi-Fi Calling feature, if it is supported by your operator and smartphone, this technology allows you to make calls over the Internet, bypassing problems with the cellular network.
⚠️ Note: Antienna stickers that are glued to the case or under the battery, in most cases, are a marketing move and do not give a real signal increase in modern smartphones with built-in antennas.
Why does the signal drop during charging?
Resetting network settings as a radical method
If none of the above methods worked, there may have been a build-up of critical network protocol configuration errors, in which case a full network reset is recommended, which will return all connection parameters to factory values.
It is important to understand that this step will remove all saved passwords from Wi-Fi networks, Bluetooth device settings and APN access point settings. However, personal files, contacts and applications will remain intact. You can reset via the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth.
Once the reset is done, the phone will restart, you will need to re-enter Wi-Fi passwords and possibly set up APNs (although they are most often downloaded automatically via SMS from the operator), which in most cases completely eliminates software conflicts that interfere with normal communication.
If even a complete reset of network settings did not solve the problem, and on other devices of the same operator in the same location the signal is excellent, it is worth considering the diagnosis of the hardware, perhaps the antenna plume has gone off or the radio module itself has failed, which will require the intervention of specialists of the service center.
Regular updates to MIUI firmware also play an important role. Xiaomi engineers are constantly releasing patches that improve modem performance and optimize algorithms for switching between towers. Check for updates in Settings → About the phone.