The problem of unstable connection or total absence of network on Xiaomi, Redmi and POCO smartphones is often an unpleasant surprise for users accustomed to high performance of the device. Owners may face a situation where the indicator indicates the presence of a signal, but calls do not pass, and the Internet is running with critical delays. This can be caused by software failures in the shell of MIUI or HyperOS, and physical factors affecting the reception of radio waves.
Before you bring your gadget to the service center, you should analyze the current situation and try to fix the settings yourself. Software methods can solve up to 80% of all communication problems without financial costs and complex system intervention. It is important to understand that the quality of communication depends on many factors: the state of the communication. SIM-maps to the selected modem modem.
In this article, we will explore the algorithms that will help stabilize the connection, cover hidden engineering menus, access point settings, and how to work with different communication standards, and take a comprehensive approach to diagnosis to identify the true cause of instability and eliminate it as efficiently as possible.
Diagnostics and primary network settings
The first step should always be basic diagnostics, which will eliminate obvious configuration errors. Often users accidentally activate flight mode or knock down the settings of the preferred network type. → SIM-Maps and mobile networks are selected the right data slot if the device supports two cards.
Consider the communication standards. Today's Xiaomi smartphones support 2G, 3G, 4G and 5G networks. However, in areas of uncertain reception, the phone can constantly "jump" between standards, which leads to connection breaks, in such cases, forced switching to 4G Only or 3G Only can be a temporary solution to the problem.
⚠️ Attention: Forced incorporation of the “Only” regime 2G» or "Only" 3G» This method can make it impossible to make calls if your operator has already disabled these standards in your area.
To quickly check the status of the communication module, you can use a hidden engineering test. Enter the code ##4636## in the dialer. In the menu that opens, select Phone Information. Here you can see the real signal power (dBm) and switch your preferred network type manually.
Setting up APN access points to speed up the internet
If voice communication is working normally but mobile internet is slow or not working at all, the problem is often with APN (Access Point Name) settings. Operators periodically change their gateway settings, and automatic settings may not work properly.
To create a new access point, go to Settings. → SIM-maps and mobile networks → Choose. SIM → Access points (APN). Click the button “New Access Point” or “Create” APN». Incorrect settings here are a common cause of slow mobile data.
☑️ Checking settings APN
Below is a table with the main parameters for popular carriers, which are most often used with Xiaomi devices in Russia. Please note that fields not listed in the table can be left empty or by default.
| Operator. | Name (Name) | Access Point (APN) | Type APN |
|---|---|---|---|
| MTS | mts | internet.mts.ru | default,supl |
| MegaFon | internet | internet | default,supl |
| Beeline | Beeline Internet | internet.beeline.ru | default,supl |
| Tele2 | Tele2 | internet.tele2.ru | default,supl |
Once you have entered all the settings, be sure to save the settings and activate the new access point by ticking it. Without this step, the changes will not take effect. If the Internet does not work immediately, it is recommended to turn on the flight mode for 10 seconds and turn it off again.
Work with the engineering menu and radio module
For advanced users who want to gain maximum control over the antenna module, a deep engineering menu is available, which allows you to control parameters that are hidden from the average user, accessed through the same code # # #4636#, but the functionality is wider.
Under Phone Information, you can find the option “Set preferred network type” where code values are available, such as NR/LTE/GSM/WCDMA (automatic choice with 5G priority) or LTE only. Choosing a particular mode can dramatically change the behavior of a phone in a weak signal environment.
⚠️ Warning: Changing the settings in the engineering menu can cause the network to disappear completely. Remember the original values or take a screenshot before making the changes so you can return everything.
There's also a "Run a Ping Test" feature on this menu that lets you check the stability of the connection to the provider's server in real time, and if the ping is high or there's packet loss, the problem is most likely on the operator's tower side, not your phone.
What do the values of dBm mean?
Physical factors and condition SIM-map
Remember that software settings are powerless against physical damage. A common cause of poor communication on Xiaomi is contact oxidation. SIM-Older Mini-SIM cards, trimmed with Nano, often work unstablely.
Recommended to remove tray SIM-maps and carefully examine contacts, plaque or contamination, gently wipe them with a soft cloth or a lastic. 5 In the years, it is better to contact the operator for a free replacement with a new one with support. 4G/5G.
Also important is the case. Metallic cases or magnetic-latch cases can shield the antenna, which in modern Xiaomi models is often embedded in the frame of the case. Remove the case and check the signal level - if it has grown, the cause is found.
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Try to change it. SIM-Sometimes one of the slots may have a micro-damage of contacts or a software bug that is solved by simply moving the card.
Resetting network settings and software updates
If the settings didn't work, you should reset your network settings, and this action will bring all your Wi-Fi, Bluetooth, and mobile settings back to factory values by removing saved passwords and access points, and it's a secure operation that doesn't affect your personal files.
You can reset via the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile network and Bluetooth. After that, the phone will reboot, and you will need to re-enter passwords from Wi-Fi networks, often solving problems with sticking the network stack.
Another critical aspect is the relevance of the software. Xiaomi regularly releases updates containing security patches and modem improvements. Go to Settings → About the phone and check for system updates.
⚠️ Warning: Before updating your firmware, make sure that the battery is at least 50% and the Wi-Fi connection is stable.
The Impact of Regional Settings on Communication Quality
A unique feature of Xiaomi smartphones is the ability to change region in system settings, which affects not only the set of pre-installed applications, but also the list of available frequencies and communication standards, some users have noted an improvement in reception after changing the region to India or Singapore.
The region change is done in the Settings menu → Additional settings → Region. Once a new region is selected, the phone may need to reboot, a method that is especially relevant for global firmware versions where there may be software restrictions on certain frequencies.
However, it is worth remembering that changing the region can affect the operation of some system applications and services (for example, Mi Home or themes), so this method should be considered experimental if other methods have not worked.
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Changing the region is a software trick that can open access to additional frequencies, but is not a guaranteed solution to hardware antenna problems.