Why Xiaomi is losing the Internet: a full analysis of the causes and solutions

You have noticed that your Xiaomi, Redmi or POCO The Internet is periodically lost for no apparent reason, and the connection is cut off for a few seconds, then disappears for a watch, and the operator claims that everything is fine, a problem that many Xiaomi smartphone owners know, and its causes can be covered as software bugs. MIUI, Unlike the stable flagships of Samsung or Apple, Xiaomi’s budget and mid-budget models are more likely to suffer from similar glitches — but the good news is that 90% of cases are resolved without a service center visit.

In this article, we will examine all possible reasons why Xiaomi loses mobile Internet or Wi-Fi — from banal settings to hidden network settings. MIUI And they're responsible for the stability of the connection, and what to do if the smartphone has stopped catching the network at all. 10/11/12, POCO X3/X4/X5 mi 11/12, where the problem is most common, if you've tried to reboot your phone or take it out. SIM-The map is just the tip of the iceberg. Let's dig deeper.

1. Software bugs MIUI: Why updates are breaking the internet

Operating envelope MIUI It is known for its unstable behavior after updates, especially for global and European firmware. Often after the update, users are faced with the fact that the mobile Internet stops working in the background (applications are not updated, messengers do not receive messages) or completely shuts down after 5-10 minutes after connecting. The reason for this is aggressive optimization of power consumption and errors in the Telephony module.

The most problematic versions MIUI user-review:

• 📱 MIUI 12.5 — cliff-flagging 4G/LTE post-sleep;
• 📱 MIUI 13 (Android 12) – a bug with a “gray” icon of the network (the connection is, but traffic is not going);
• 📱 MIUI 14 (Android 13) - Dual issues SIM switching between operators.

How do you check if the firmware is to blame? Go to Settings → The phone. → Version. MIUI Compare it to the latest reviews on the forums (for example, the list, 4PDA If your version is blacklisted, there are two solutions:

1. Reverse to stable firmware via Fastboot (instruction below).
2. Enable developer mode and disable optimization for specific applications (such as Telegram or WhatsApp).

⚠️ If after the update, the Internet disappeared on Xiaomi with two SIM-maps, check the settings settings → SIM-maps and mobile networks → Preferred network. In some versions MIUI slot SIM2 drop off 3G, The operator supports 4G.

2. Settings APN: Why does the operator not provide the Internet?

One of the most common reasons for the lack of Internet on Xiaomi is the wrong or incorrect settings. APN (Access Point Name: This is especially true after:

• 🔄 Shifts SIM-The card (even if the operator is the same);
• 📥 Firmware updates;
• 🔧 Resetting settings to factory;
• 🌍 Roaming travel.

How to check APN Xiaomi:

1. Go to Settings. → SIM-maps and mobile networks → [Choose. SIM] → Access points (APN).
2. If the list is empty or there is only one item with the operator’s name, the settings are lost.
3. Press Add Add Add. APN Enter the settings manually (you can find them on your operator’s website).

Example of correct settings APN for popular operators (Russia/CIS):

If, after preservation, APN The internet didn't come up, try it:

• 🔄 Reboot the phone;
• 📶 Manually select the operator network in Settings → Mobile network → Network operators;
• 🗑️ Remove all the old ones APN And create a new one from scratch.

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On some Xiaomi models (for example, Redmi Note 10 Pro) settings APN They can be blocked by the operator. If you reset them after you enter them, try inserting them. SIM-card to another phone, set up APN Then return the card to Xiaomi.

3.Problems with SIM-map: from oxidation to incompatibility

Physical defects SIM-A card or slot is the second most common cause of loss of the Internet on Xiaomi, and the problem can manifest itself selectively: for example, calls work, but mobile Internet does not, or vice versa:

Symptoms of malfunctioning SIM-map:

• 📵 The phone periodically loses the network (the antenna icon disappears);
• 🔄 You have to switch the mode "On the plane" to restore communication;
• 📱 In the settings SIM-The card displays a message “No service” or “Registration error»;
• 🔌 The Internet only works when connected to Wi-Fi.

What to do:

1. Look around. SIM-Map: Take it out of the tray and check for scratches, chips or oxidation of contacts (dark plaque). If the contacts are dimmed, gently wipe them with a wipe or an alcohol wipe.
2. Check the tray: On Redmi Note models 8/9 and POCO X3 latch breaks SIM-If the card is not tight, put a piece of tape to fix it.
3. Test on another phone: Insert SIM-If the problem persists, it is the operator's fault or the card itself (it may be time to replace it with a new nano-SIM).

⚠️ Note: Xiaomi with Dual Support SIM (For example, the Redmi Note 11 Pro+) There can be conflict between slots. If the Internet is lost on only one of them. SIM-map -- try swapping them. In some cases, it helps to turn off the second slot in the settings.

4. Energy saving mode and background optimization

MIUI It aggressively optimizes background data consumption to extend battery life, and as a result, many applications (especially instant messengers and email clients) stop updating, and the mobile Internet falls asleep after a few minutes of inactivity. It's not a bug, it's a feature — but it can be turned off.

Where to look for settings:

1. Settings → Battery and productivity → Power Saving Mode – Turn it off or select “Adaptive Mode».
2. Settings → Annexes → Application management → [Select the application] → Battery – Install “No Limitations».
3. Settings → Connections and sharing → Use of data → Background data transfer – turn on for all applications.

On models with Android 12+ (for example, Xiaomi 12T or POCO F4) Add another item:

Settings → Special features → Application improvements → Disable “MIUI Optimization”

If the Internet is still missing after these manipulations, check:

• 🔋 Settings Settings → Battery → Power modes – choose Performance instead of Balance».
• 📶 Settings setting → SIM-map → [Yours. SIM] → Turn on 4G/VoLTE — Sometimes it is reset after updates.

Hardware malfunctions: antenna, communication module, soldered contacts

If the software methods don't work, the problem can be in the hardware, and most often, it fails.

• 📡 Antenna module - especially after falls or moisture;
• 🔌 Contacts SIM-squashing – oxidized or moved away from the fee;
• 📶 Communication module (e.g. Qualcomm Snapdragon) X51 Redmi Note 10 – overheated or damaged;
• 🔋 Battery - with strong wear (>500 cycles) may cause failures in the antenna power module.

How to diagnose a hardware problem:

1. Check the signal level in the engineering menu: ##4636## → Phone information → Signal level GSM/CDMA/LTE If the values RSRP (for 4G) below -110 dB ASU equal 0 — antenna is down.
2. See if the phone is overheating in the upper part (where the antenna is located), if so, you may break the circuit or short circuit.
3. Connect to Wi-Fi. If the Internet through the router is stable, but the mobile is not, the problem is precisely in the communication module.

Typical "iron" symptoms:

⚠️ Note: If your Xiaomi fell into the water or was subjected to a strong vibration (for example, in a car without a mount), do not try to disassemble it yourself. moisture could get under the screen on the antenna contacts - in this case, you need professional ultrasound cleaning.

Conflicts with VPN, Firewalls and antiviruses

Data protection or block-bypassing applications often cause the internet to go missing on Xiaomi, especially in the following areas:

• 🔒 VPN-clients (e.g. NordVPN, ProtonVPN);
• 🛡️ Antiviruses (Avast, Kaspersky, 360 Security);
• 🔥 Firewalls (NetGuard, AFWall)+);
• 📡 Applications for Internet Speed Master).

How to check:

1. Launch your phone in Safe Mode (press the power button) → «Safe mode. If the Internet is up, one of the installed applications is to blame.
2. Check the settings. VPN: Some customers (such as WireGuard) block mobile traffic when a connection is broken.
3. Turn off traffic savings in antiviruses (for example, Avast has the option “Block background data”).

If the problem is VPN, try:

• 🔄 Change the protocol (for example, from OpenVPN to WireGuard);
• 🌍 Connect to another server (some of which are IP It can be blocked by the operator);
• ⚙️ In the settings VPN Disable the option “Block connections without VPN».

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On Xiaomi MIUI 14+ The built-in firewall can block the Internet for individual applications. → Privacy → Special permits → Access to data and add the necessary programs to exceptions.

7.Problems with IMEI: Why is the phone not registered on the network?

If your Xiaomi suddenly stopped catching the network at all (no calls, no Internet), and in the status bar is burning cross on the antenna icon – probably lost or flew off. IMEI. It's a unique device identifier, without which the operator cannot authorize it on its network. IMEI:

• 🔄 Failed firmware update;
• 📱 Resetting settings to factory;
• 🛠️ Improper unlocking of the bootloader (bootloader);
• 📡 Damage to the module NVRAM (stored IMEI).

How to check for IMEI:

1. Type *#06# if the 15-digit code is Null or Unknown, IMEI fly off.
2. Check the engineering menu: ##4636## → Phone information → IMEI

How to restore IMEI to Xiaomi:

1. If IMEI Disappeared after the update - try to roll back to the previous version MIUI via Fastboot.
2. If IMEI After the reset, use utilities like Maui. META or SN Write Tool (requires PC and cable).
3. If the problem is NVRAM — I need to reflash through SP Flash Tool with the correct file modem.img.

⚠️ Attention: Recovery IMEI on modern Xiaomi (for example, Redmi Note 12 or POCO X5) It can shut down the network forever if you use the wrong tools.

8. Alternative solutions: from reset to firmware

If none of these methods work, there are radical measures that you should only take if you're sure that the problem isn't the problem. SIM-map-cart.

Resetting network settings:

1. Go to Settings. → System system → Additionally. → Resetting settings → Resetting network settings.
2. Confirm the action – the phone will restart, and all network settings (Wi-Fi, Bluetooth, mobile data) will be reset to factory.

Hard Reset (Hard Reset):

• 🔄 Save all data (photos, contacts, messages) on PC or in the cloud.
• 📱 Go to Settings. → The phone. → Resetting settings → Delete all data.
• 🔑 If the phone is locked, press the volume up. + Power to log in to Recovery, then select Wipe Data.

Fastboot flashing:

If the problem occurs after the update, try installing a stable version. MIUI manually:

1. Download the official firmware for your model from the Xiaomi Firmware website.
2. Unpack the archive and connect the phone to your PC in Fastboot mode (clip Volume Down + Power).
3. Run the script. flash_all.bat (Windows or use the Mi Flash Tool.

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Before the firmware, be sure to unlock the bootloader through the official Xiaomi website. SMS-code!

FAQ: Frequent questions about the missing Internet on Xiaomi