Mobile Internet on Xiaomi is not working well: all the reasons and how to fix it

Have you noticed that your Xiaomi mobile Internet is getting worse: pages load forever, video slows down, and messengers are updated with a delay? The problem is familiar to many owners of smartphones of this brand — from the budget Redmi to the flagship Mi 13 Ultra. Unlike iPhone or Samsung, where network problems are often solved automatically, devices on MIUI require manual configuration.

In this article, we will discuss 12 key reasons why mobile Internet on Xiaomi can work unstable – from banal errors in settings. SIM-You will learn how to diagnose a problem with built-in tools (e.g. ##4636##), what network settings are optimal for your region, and why factory resets sometimes help. And also - unique data on the compatibility of Xiaomi models with networks 5G in Russia in 2026, which are not in official documentation.

1. Wrong APN settings: how to fix manually

The first thing to check is the access points. APN (Access Point Name, even if SIM-The card is automatically determined, operators often update the parameters, and MIUI It doesn't always pull up the actual data. For example, MTS changed its address in 2026. APN for 5G-If your Xiaomi is using the old settings, the speed will be limited.

To check and change the APN:

• 📱 Open the Settings. → SIM-maps and mobile networks → [yours SIM] → Access points (APN).
• 🔍 If the list is empty or there is only one profile with the name of the operator, it should be edited.
• ⚙️ Click on the existing one. APN Or create a new one (button "+" top-right).
• 📝 Enter the settings for your carrier (see table below). Save and restart the phone.

⚠️ Note: If after the change APN The internet is gone, check if the “only” mode is activated. 2G" This is a common error in manually editing parameters.

2.Problems with SIM-From physical defects to incompatibility

Xiaomi’s SIM problems fall into three categories: physical (chip damaged), software (slot malfunction) and technical (operator network incompatibility).For example, Redmi Note 12 smartphones with Snapdragon 4 Gen 1 processor sometimes work incorrectly with the device. SIM-Nano-SIM cards cut out of micro-SIM – contacts may not fit tightly.

How to check:

• 🔍 Visual inspection: Get out SIM-check for scratches, chips or contamination of contacts.
• 📶 Testing in another device: Insert SIM If the Internet works, the problem is in the smartphone, if it doesn't, it's in the card or the operator.
• 🛠️ Switching slots: On two-symbol Xiaomi (for example, POCO X5 Pro) try to rearrange SIM Sometimes one of the modules fails.

⚠️ Note: If after the reshuffle SIM The phone stopped seeing any of the cards, which is a sign of a hardware malfunction in the communications module, and in this case, only the service center will help.

3. Mistakes of MIUI firmware: bugs and how to get around them

MIUI It's known for its features, but it's also got a lot of bugs, especially in the latest versions. MIUI 14 for Xiaomi 13T There was a bug that caused the phone to automatically switch to 2G low-signal 4G, instead of holding on 3G. As a result, the speed fell to 50 Kbps. corrected this only in the update V14.0.8.0.TMWMIXM.

How to know if the fault is firmware:

• 📉 Internet speed drops sharply after update.
• 🔄 Options are missing in network settings (for example, you can’t select a network type).
• 📡 Signal indicator shows 4G, but the speed is like 2G.

Decisions:

1. Update your firmware to the latest stable version: Settings → About Phone → System Update.
2. If the update does not help - rollback to the previous version (instruction below).
3. Reset network settings: Settings → System → Reset settings → Reset mobile network settings.

1. Make a backup of data in Mi Cloud

2. Check the battery power (minimum 60%)

3. Download the desired firmware version from the official website (for example, MIUI Downloads)

4. disable the boot loader lock (if required)

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4. Non-optimal network settings: 4G vs 5G, VoLTE and other nuances

By default, Xiaomi chooses the network mode automatically, but this is not always optimal. 5G-network (n78) It is not working properly and the phone is constantly switching between 4G and 5G, If you lose communication, or vice versa, if you select "Only" in the settings. 4G", The operator is actively developing 5G, You can lose your speed.

How to set it up manually:

1. Go to Settings. → SIM-maps and mobile networks → [yours SIM] → Type of network.
2. Choose: 📶 4G (recommended - if 5G your town is unstable. 🚀 5G — if the operator supports and the signal is stable. ⚡ Only 3G — provisional decision if 4G/5G doesn't work.

VoLTE

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If the Internet is gone after the network change, restart the phone, and sometimes the communication module freezes when the standards switch.

5. App conflict: Who is stealing your traffic?

Some apps may block or restrict mobile internet, most often to blame:

• 🛡️ Antiviruses (Avast, Dr.Web) scan traffic and slow down the connection.
• 🔒 VPN-Customers (e.g. Turbo) VPN) — If the server is overloaded, the speed drops by 10 times.
• 🎮 Gaming accelerators (Game Turbo) MIUI) — Can limit background traffic.
• 📥 Download managers (IDM, ADM) — If they have a speed limit.

How to find and resolve conflict:

1. Run your phone in Safe Mode (press the power button → Safe Mode) If the Internet is working normally, the third-party application is to blame.
2. Check the permissions of the applications: Settings → Applications → Permissions Management → Mobile data.
3. Turn off traffic optimization in Settings → Battery and Performance → Traffic optimization.

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If the problem occurs after you install a new app, delete it and check your internet speed, and Chinese apps (such as UC Browser or APUS Launcher) that aggressively cache data are often to blame.

6. Hardware malfunctions: when to carry in the service

If all software methods have been tried and Xiaomi’s mobile internet still doesn’t work well, the reason could be a hardware breakdown.

• 📵 The phone doesn’t catch the network at all (even if it’s not a phone). 2G), though SIM-card.
• 🔌 The signal indicator floats from 0 to 4 divisions without a reason.
• 🔥 The phone overheats in the area of the antenna module (upper part of the body).
• 🛠️ After falling or getting moisture, the Internet is gone (even if the screen is intact).

The most common hardware problems:

⚠️ Note: If you suspect a hardware malfunction, do not try to disassemble the phone yourself - on Xiaomi, antenna plumes are very fragile and can be easily damaged if you carelessly handle them).

7. Regional restrictions and blocking of operators

In 2026, Russia has restrictions on imported smartphones, and some Xiaomi models (especially those released for the European market) may have problems connecting to local networks. For example, the Xiaomi 12T Pro with global firmware does not support the n79 (5G) bands that MegaFon uses in Moscow.

How to check compatibility:

1. Find out your phone model (Settings → About Phone → Model). For example, Redmi Note 11 Pro 5G for Russia has the index pissarro, and for Europe – veux.
2. Check the supported ranges on the FrequencyCheck website.
3. Compare it to your operator’s ranges (information on their official websites).

Decisions:

• 🌍 If you bought your phone abroad, go to the Russian version. MIUI (instruction 4PDA).
• 📡 Use an external antenna (e.g., Xiaomi Mi WiFi Amplifier 2) to amplify the signal.
• 🔄 Switch to a carrier with wider coverage (e.g. Yota on MTS).

8. Alternative diagnostic methods: engineering menu and tests

If standard methods don't work, it's time to dig deeper. Xiaomi has hidden tools to diagnose the network:

Engineering Menu (MTK/Qualcomm):

• For MediaTek processors (e.g. Redmi Note 12): type in ##36446337###.
• For Qualcomm (POCO F5, Xiaomi 13): ##4636## → Phone Information.

In the engineering menu, pay attention to:

• 📶 Network Type: What network standard is used, LTE or NR (5G)).
• 🔢 Signal Strength: signal level in dBm (norm: from -70 before -100).
• 🔄 Service State: If Out of Service status is not available.

Speed test:

Use Speedtest or FAST.com, but with nuances:

• 📊 Run the test 3-5 times in a row and take the average value.
• 📍 Compare results with other devices in the same location.
• ⚡ If the speed is below 10 Mbps at full signal 4G — The problem is definitely on your side.

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In Qualcomm’s engineering menu, you can manually select LTE bands. For example, for MTS in Moscow, the optimal B3 (1800 MHz) and B7 (2600 MHz) are optimal. But beware – the wrong settings can leave you without communication!

FAQ: Frequent questions about mobile Internet on Xiaomi