Many Xiaomi and Redmi smartphone owners are periodically faced with a situation where the device suddenly loses the network, slowly loads pages in the zone of confident reception or switches between 3G and 4G for no apparent reason. The problem can be either in software failures of the MIUI or HyperOS shell, or in the hardware of a particular communication module.
In this article, we will discuss all available methods of stabilization of communication, starting from the banal check. SIM-Competent setting can significantly affect the speed of the Internet and the quality of voice communication, especially in conditions of noisy air in apartment buildings or remote areas.
Diagnostics and basic inspection of equipment
Before we go into the complex settings, we need to eliminate the physical factors that affect the quality of the reception — SIM-A card that may have worn, oxidized, or simply been misplaced in a tray, and old Mini-SIM cards that are trimmed under Nano-SIM can fit loosely into the contacts, causing permanent breaks in the connection.
Also worth looking at are protective covers. Some accessories, especially those that contain metal elements or magnetic car mounts, can shield the smartphone antenna. Take off the case and check the signal level at different points in the room. If the situation improves, the cause is found.
An important step is to check the integrity of the SIM card tray.Make sure it is inserted before the click and is properly oriented.In models with a hybrid slot (SIM + microSD), improper installation of the memory card can block the second slot or cause interference.
- 📱 Extract. SIM-map, wipe the contacts with a soft dry cloth and paste back.
- 📡 Check the SIM card in another device to prevent the module itself from breaking.
- 🔌 Make sure the tray is not deformed and fits tightly to the body.
- 🛡️ Remove the case with metal inserts and check the level of reception.
⚠️ Attention: If yours SIM-The card has been in use for more than 5 years, has visible scratches on the contacts or has been cut with scissors, it is likely that it is the cause of unstable operation.
Setting up APN access points to speed up the internet
Often, mobile internet speeds on Xiaomi suffer from incorrect access point (APN) settings. Operators periodically change network settings, and automatic settings coming via SMS may not be optimized for specific regions or tariff plans.
For manual settings go to the Settings menu → SIM-maps and mobile networks → Choose yours. SIM → Access points (APN). Here you will see a list of available profiles. Click the button New access point or edit the existing one with the name of your operator.
The key is the APN type field. For most modern networks, you need to write down the default,supl or default,supl,dun. In the APN protocol field, select IPv4/IPv6 to ensure compatibility with all types of traffic. Remember to save the settings and restart the smartphone.
| Parameter | Importance to MTS | Meaning for Beeline | Meaning for MegaFon |
|---|---|---|---|
| Name. | MTS Internet | Beeline Internet | Megafon |
| APN | internet.mts.ru | internet.beeline.ru | internet |
| User | mts | beeline | gdata |
| Password. | mts | beeline | gdata |
⚠️ Note: When creating a new access point, be sure to click the menu (three dots in the corner) and select Save, otherwise all the data entered will be lost when leaving the menu.
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After changing the APN settings, turn on the flight mode for 10 seconds so that modem re-registers on the network with new parameters.
Use of the Engineering Menu and Selection of the Preferred Network
One of the most effective methods is to force the choice of network type through the Android engineering menu. By default, the smartphone can often "jump" between the two. 3G and 4G in border areas that consumes the battery and breaks the connection. LTE can solve the problem.
To enter the test menu, dial ##4636## in your phone. The hidden "Verify" menu will open. Select Phone Information. Find "Set up your preferred network type."
In the drop-down list, select LTE Only if you are in a 4G confident reception zone but the internet is unstable due to constant reconnections. If you need voice over VoLTE, select LTE/TD-SCDMA/CDMA/EvDo/GSM/WCDMA.
What if the code doesn't work?
Be careful when choosing a regimen. LTE Only if you don't have any coverage in your area. 4G, You will be completely unconnected as the phone will no longer see the towers. 2G and 3G. To return to normal mode, it is enough to enter the menu again and select the standard option. LTE/WCDMA/GSM (auto connect).
Changing the region and resetting network settings
Xiaomi firmware has some radio module features tied to a selected region, for example, in some countries, the limits on the frequency of Wi-Fi and cellular communication are different, changing the region can shake up the radio module and force it to re-scan the air.
Go to Settings → Advanced Settings → Region. Try to choose another country, like Indonesia or India if you have a global version, or any European country. After changing region, the phone may reboot or require manual restarting.
If region change didn’t help, perform a full network settings reset.This action will delete stored Wi-Fi passwords and Bluetooth settings, but often resolves mobile phone issues.The path to function: Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth → Reset settings.
☑️ Checklist before network reset
Working with the modem and updating the firmware
The software part responsible for communication is called a modem (baseband). In Xiaomi smartphones, it is updated along with the firmware of the system, but sometimes there are situations when the firmware version is relevant and the modem drivers work incorrectly.
Check the modem version in the About Phone menu → All options, the "Modem version" line. If you haven't updated the system in a long time, it is recommended to do this through Settings → About Phone → Update MIUI. New versions often contain security patches and improvements in stability of communication.
In rare cases, flashing the modem separately helps, but this is a complex procedure that requires an unlocked bootloader and special tools (QFIL, MiFlash).It is safer for the average user to wait for an official update or perform a full reset to the factory settings (Wipe All Data), previously saving data.
Critical: If, after complete reset and replacement, SIM-cards for a new problem are stored on all communication operators, the probability of hardware malfunction of the antenna module or plume is high.
Effects of MIUI shell and background processes
The MIUI shell is known for its aggressive energy savings, which can misoperate with the radio module. The system can limit the background activity of applications responsible for synchronization or VoIP telephony, which creates the illusion of poor communication.
Check battery settings for important applications. Go to Settings → Applications → All applications, select the right one (like messenger), go to "Saving Charge" and set the value "No limits. Also turn off power saving in standby mode."
Another nuance is Network Assistant, which allows the phone to use Wi-Fi to speed up mobile internet if the cellular signal is weak. It's in Settings → Wi-Fi → Wi-Fi Assistant. Try turning it off, as it can cause conflicts when switching between interfaces.
- 🔋 Turn off Ultra-Energy Saving when dealing with important calls.
- 📶 Enable the “Always Search Network” mode in the mobile network settings.
- 🚫 Turn it off. VPN-Services if they are not used continuously.
- 🔄 Regularly clean the cache of the system application "Phone".
⚠️ Note: Game Turbo can also change network priorities, giving all traffic to the game. If you lose calls during the game, add contact to exceptions or configure network operation in the game profile.
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A comprehensive approach, including SIM verification, APN configuration and region selection, solves 90% of software communication problems on Xiaomi.