How to Improve the Quality of Communications at Xiaomi: A Complete Guide

Modern Xiaomi smartphones are famous for their functionality, but users often face unstable mobile Internet or interruptions of voice calls. Problems can lie in software failures of the MIUI operating system, and in the hardware limitations of the antenna of a particular device.

In this article, we'll look at proven methods to help you fix connection breaks, learn how to properly configure priority frequencies and what hidden features are available to fine-tune the network, and have a good configuration that can work wonders even in areas of uncertain reception.

Diagnostics of current network problems

Before you start taking drastic measures, you need to pinpoint the source of instability. Often users confuse operator problems with phone malfunction. First, check how the SIM card works on another device to prevent card failure or failure on the provider side. This is a basic but critical step.

If you look at the indicators in the upper right corner of the screen, if the 4G or 5G icon is often changed to 3G or E, then the device is constantly looking for a more powerful base station, this behavior is typical for congested networks or when the coverage of two towers is at the border, in which case the phone wastes battery power trying to hold the connection.

For more detailed diagnostics, you can use special codes. Type ##4636## in the Phone app. If the menu opens, go to Phone Information. This shows the signal level in dBm: the smaller the number (closer to zero), the better the connection. A value below -110 dBm is considered critical.

⚠️ Warning: Do not change the values in the engineering menu if you are not sure of their purpose. Resetting the network settings can lead to complete disappearance of the signal, which will have to be restored by flashing the modem.

Basic network settings and module reboot

The easiest and often ignored way to solve problems is to reboot the radio properly. Many users simply turn off and turn on the phone, but it's not always effective. It's much better to use flight mode. Turn it on for 10-15 seconds and then turn it off. This causes the modem to re-register on the network and choose the optimal base station.

It's also worth checking the settings of the preferred network type. In today's environment, there's no point in keeping the forced mode. 2G/3G, As these standards are gradually being phased out, go to the Settings menu. → SIM-maps and mobile networks → Preferred network type and select “Preferred” LTE» or «5G», If your locality and your location support it.

Owners of two-symbol devices often forget that when talking actively on one of them. SIM-The second card can be placed in a waiting mode. 2G. If you use the mobile Internet on the second card during a call, the speed may drop to a minimum, in such cases, it is recommended to turn off the second SIM card during important conversations or using the navigator.

Using an engineering menu to fix

For advanced users, frequency band-fixing is available. This is especially true if you're in an area where the phone is constantly "jumping" between 4G and 3G, causing communication to be interrupted. Forced switching to LTE alone can stabilize the connection even if the speed is not maximum.

To access these settings, enter the code ##4636##. In the menu that opens, look for "Preferred Network Type Settings." You can select "LTE only" mode, but be careful: in this mode, incoming calls may not pass unless VoLTE technology is enabled. After checking, remember to return the settings to the original state.

Another important parameter is Roaming. Even if you haven't traveled abroad, in border areas, the phone may try to connect to the towers of a neighboring state where you don't have roaming. Make sure that in your mobile settings, the data roaming slider is turned off if you're in your region, which will prevent unnecessary attempts to log in to other networks.

Reset network settings and update APN profiles

Often, the cause of unstable Internet is incorrect access points (APNs), which are the addresses where the phone connects to the operator's gateways to access the Internet, and if this data is outdated or corrupted after the system update, communication will malfunction.

To correct the situation, go to Settings → SIM-maps and mobile networks → (Yours. SIM) → Access points (APN). At the bottom of the screen, click Reset or Restore by Default. The phone will download the current settings from your carrier.

If automatic reset didn't work, you can create a new access point manually using the data in the table above. Note the letter register: in APN, it's often important to write the address exactly as the operator indicates, usually all letters are lowercase. An error in one character can lead to no data transfer.

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Before you change your APN settings, take a screenshot of your current settings. If the new settings don't work, you can easily return everything as it was just by typing the data back in.

Influence of covers and external factors

Don’t underestimate the impact of accessories on reception quality. The antennas in Xiaomi smartphones are often located around the perimeter of the case or at the top of the back cover. Metallic cases, magnetic car case or thick protective glass can shield the signal.

If you take the cover off and check the signal level, if you notice a difference, you might want to consider replacing the accessory with a thinner one, or one made of materials that don't interfere with the passage of radio waves, and plastic and silicone don't usually cause problems, unlike metal and carbon fiber inserts.

And the quality of communication is directly dependent on battery power. With a low charge level (less than 15%), some smartphone models can artificially reduce the power of the transmitter to save energy. If you need to make an important call and the battery is running out, you better connect the device to charge.

⚠️ Warning: If the signal does not improve after removing the case and restarting, check the SIM card contacts. Oxidation of the gold contacts can lead to periodic network losses.

When Reset to Factory Settings is Required

If none of the software methods worked, there may have been some critical configuration errors in the system, in which case a full reset may help. Remember that a full reset will delete all your data, so be sure to back up your contacts and photos before starting the procedure.

You can reset via Settings menu → About phone → Reset → Erase all data. After this operation, the phone will return to the “out of the box” state, and all network settings will be reset to factory values. Often this solves problems that arose after unsuccessful firmware updates.

However, even if the problem persists after the reset, there is a high probability of hardware malfunction, such as a retiring antenna plume, damage after a fall, or failure of the radio module itself, in which case the software methods are powerless, and a visit to the hardware diagnostic center is required.

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A comprehensive approach: a combination of resetting network settings, checking the physical status of the SIM card and fixing the frequency range solves 90% of communication problems on Xiaomi.

Frequently Asked Questions (FAQ)