Why the Internet is not working on Xiaomi phone: a complete guide to diagnosis and repair

You picked up your Xiaomi Redmi Note 12 or POCO X5 Pro and the Internet suddenly stopped working? Pages are not loaded, messengers are not updated, and the 4G/5G icon flashes with an exclamation point or disappeared? This problem is familiar to millions of users of Xiaomi smartphones — and it can have a dozen reasons, from a banal error in settings to a hardware failure of the communication module. In this article, we will analyze all possible scenarios why the Internet does not work on a Xiaomi phone, from the most obvious to the hidden, which are not written even in the official documentation.

Important: If you lost the Internet after upgrading MIUI to version 14.0.5+, the problem may be due to a bug in the firmware — this is discussed in detail in the section on software failures. And if the phone does not catch the network at all (there is not even an operator icon), immediately go to the block about hardware malfunctions.

We won’t offer “reboot phone” as a panacea – instead, you’ll get clear instructions with screenshots, compatibility tables, and a few more. SIM-And the maps, and the diagnostics that Xiaomi's engineering centers use, so let's start with the simplest and end with what to do if none of the methods worked.

1. Checking the basic settings: SIM-map, flight mode and traffic restrictions

Before you dig deeper, make sure that the problem isn't just the basic settings. SIM-cards: even if it's been inserted a long time ago, the contacts may have oxidized and the slot may have loosened a little:

• 🔍 Microscopic scratches on a chip? That might block the connection. Try gently erasing the contacts with a pinworm.
• 📱 Slot SIM Blow it with compressed air (not your mouth!) or clean it with a cotton swab soaked in alcohol.
• 🔄 Reinstall the card to another slot (if you have Xiaomi with two). SIM). Sometimes the main slot goes out of order.

Check the flight mode and related settings:

1. Open the Settings. → SIM-maps and mobile networks.
2. Make sure the mobile data switch is active (should be blue).
3. Tap your name on it. SIM-maps and check if the items are included 4G/5G and Transfer of data.

If the internet is running but extremely slow, background restriction may have been activated. Go to Settings → Applications → Traffic Management and turn off browser and instant messenger restrictions.

APN Settings: Why Automatic Settings Don't Always Work

APN (Access Point Name is the address that connects your phone to your carrier's Internet. 90% of the time you set up your phone. APN They are automatically installed, but sometimes they get lost, especially after an update. MIUI shift SIM-If the Internet doesn't work, but the calls are coming, the problem is APN.

How to check and correct:

1. Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Access points (APN).
2. If there are several profiles, choose the one that corresponds to your operator (for example, Internet.mts.ru for MTS).
3. If there is no profile, click Add APN and enter the data manually (see table below).

⚠️ Note: If after manual input APN The internet never worked, delete all other profiles APN — Sometimes the phone tries to connect through an outdated profile.

3. Software failures: When MIUI firmware is to blame

One of the most insidious sources of problems with the Internet on Xiaomi is bugs in the firmware MIUI. For example, in versions 14.0.3–14.0.5 There was a massive bug that caused phones to lose communication with the network. 4G/5G after the reboot. POCO F4 on MIUI 13.1.2 There were problems with priority SIM-map.

How to diagnose:

• 📱 Check the version. MIUI In Settings → If it's older than 14.0.6, upgrade.
• 🔍 Google the search for “model of your Xiaomi” + no internet + version MIUI". Often on forums (for example, 4PDA or XDA Developers already have solutions.
• 🛠️ If the bug is confirmed, try rolling back to the old firmware via Fastboot (instruction below).

For firmware rollback:

1. Download the desired version of MIUI from the official Xiaomi website.
2. Unclose the file and move it to the platform-tools folder (where ADB is installed).
3. Connect your phone to your PC in Fastboot mode (clip Volume Down + Power when your phone is off).
4. Enter the command: fastboot flash recovery name file.img fastboot reboot

⚠️ Attention: Firmware rollback erases all data! pre-backup through Settings → Additionally. → Backup.

Hardware malfunctions: from antenna to motherboard

If none of the software methods worked, the problem could be the hardware, and here are the most common hardware reasons:

• 📡 Symptoms: Internet only works near the window or disappears when the phone changes position.
• 🔌 Oxidized contacts SIM-It's common after moisture is infused, solution: cleaning with alcohol or replacing the tray.
• 🛠️ Faulty communication module (Qualcomm Snapdragon modem) X55/X60 Symptoms: the phone doesn't catch the network at all, even for calls.
• 🔋 Bloated capacitors on the motherboard. This could block power to the communications module.

How to diagnose:

1. Try inserting. SIM-If the Internet is working, your Xiaomi is a problem.
2. Check if the phone catches the network of other operators (ask a friend) SIM-map).
3. Use the engineering menu: ##4636### In the Phone Information section, check the network status. If the Service State bar is Out of Service, it indicates a hardware malfunction.

⚠️ Warning: If the phone has fallen into water or been subjected to severe vibration (for example, in a car without a mount), do not try to disassemble it yourself - contact the service.

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Before visiting the service center, take a picture of the phone's IMEI (type *#06#) to prove that the phone is not blacklisted (if it is suddenly changed to another).

5.Problems with the operator: locks, restrictions and technical work

Sometimes the problem isn't with the phone, it's with the operator.

• 🚫 Blocking for non-payment. Even if you have a positive balance, check if the Deferred Payment service is activated".
• 📵 Speed limit: Some operators (e.g. Tele2) do not shut down the Internet after the traffic is exhausted, but simply slow down to 64 Kbps.
• 🔧 Check the status of the network on the operator's website or in its official Telegram channel.
• 🆔 Incompatible with new standards. SIM-Card (released before 2018) may not support VoLTE or 5G.

How to check:

1. Call the operator (from another phone) and ask to check the status of your line.
2. Send. USSD-request for balance check and active services: MTS: *100# Beeline: *102# Megaphone: *105# Tele2: *107#

eSIM

Settings → SIM-map → ESIM management

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If the operator says that everything is fine on his part, but the Internet is not working, demand a written response with a diagnosis.

6. Conflicts with VPNs, firewalls and third-party applications

Third-party apps can block the Internet even if you haven't run them, and most often, the fault is:

• 🔒 VPN-clients (e.g. NordVPN or ProtonVPN) can "hang" in the background and redirect all traffic through a broken server.
• 🛡️ Firewalls (NetGuard, AFWall)+). Sometimes they block the system processes that handle mobile data.
• 🤖 Optimizers (Clean Master, DU They can disable "unnecessary" services, including those responsible for communication.
• 📱 Lawnchair and other launchers, some of which are in conflict with Xiaomi's system services.

How to fix it:

1. Run your phone in Safe Mode (press the power button → Safe Mode). If the Internet is up, it's the third-party app's fault.
2. Check application permissions: Settings → Apps → Permissions Management → Autorun Disable Autorun for suspicious programs.
3. Reset Network Settings: Settings → System → Settings Reset → Resetting Wi-Fi, Mobile Network and Bluetooth settings

If the problem occurs after installing Magisk or root rights, try rolling back changes through Magisk Manager or reflash boot.img.

7. Features of Xiaomi models: what breaks most often

Some Xiaomi models have Internet-related "diseases," and the most common ones are:

If you have one of these patterns, first check if your problem is on the list of "diseases." POCO X3 Often helps a simple shutdown of the second SIM-card.

FAQ: Frequent questions about the Internet problems on Xiaomi