If your Xiaomi smartphone suddenly starts losing communication, slow loading pages or refuses to connect to mobile Internet or Wi-Fi at all, the problem can be in the settings of the device and hardware malfunctions. Users often find that even flagship models like Xiaomi 13 Ultra or Redmi Note 12 Pro+ show unstable connection, while devices of other brands in the same location work without complaint.
In this article, we’ll look at 12 key reasons why Xiaomi can catch the Internet poorly, from simple errors in settings to hidden defects in the antenna module. You will learn how to diagnose the problem yourself, which parameters to check first, and when to contact the service center. MIUI, which often become a source of network lags.
Importantly, if the problem only manifests itself in certain conditions (such as in the subway or in the country), this may indicate regional restrictions or incompatibility with the operator.
1.Problems with SIM-map: from contact oxidation to incompatibility of standards
The first thing to check is the physical condition. SIM-Even microscopic damage to contacts or improper nano-SIM cut can lead to network loss or switching to a new location. 2G instead 4G/5G.
Typical symptoms:
- Phone doesn't see" SIM-post-reset.
The icon of the network flashes or disappears in motion.
Internet speed drops to EDGE (the “E” icon in the status bar).
- 🔍 Check the contacts. SIM-cards for scratches, oxidation or contamination, wipe them with a wipe or an alcohol napkin.
- 📱 Check compatibility: some Xiaomi models (e.g., the same as the one you see here, POCO X5 Pro) not supported 5G two-way SIM-card.
- 🔄 Reinstall. SIM-a card to another slot (if there are two) Sometimes the main slot is better caught by the network.
- 📡 Make sure the carrier supports the frequencies of your device. 10A It does not work with the 800 MHz Band 20, which uses Tele2 in some regions.
⚠️ Note: If you are using a virtual SIM (eSIM) on models like Xiaomi 13 Lite, make sure that the operator profile is activated correctly. MIUI.
2. Mobile network settings: Hidden MIUI settings that break the connection
MIUI firmware is known for its abundance of hidden settings that can conflict with mobile internet, such as automatic network selection often being confused with 3G instead of 4G, and Smart Switching (in some regions) forcibly shutting down the internet when a signal is weak.
How to check and correct:
- Go to Settings. → SIM-maps and mobile networks → [yours SIM] → Type of network.
- Manually choose 4G (preferably) or 5G (if supported). Avoid Auto mode - it can stick to slow standards.
- Turn off the option "Enable VoLTE" (if any) and restart the phone, which sometimes conflicts with the Internet connection.
- In the menu Additional settings → Access points (APN) Make sure that the parameters meet the requirements of your operator. APN It should be internet.mts.ru.
A critical feature of MIUI: some firmware versions (e.g. MIUI 14.0.3 for Redmi Note 11) have a bug that prevents the phone from saving APN settings after rebooting.
☑️ Checking the mobile network settings
3. Software failures: cache, updates and "broken" firmware
The Android operating system on Xiaomi devices uses cache to speed up network functions. However, over time, this data can be corrupted, leading to a freeze in the communication module or inability to connect to the Internet. Also, problems often arise after MIUI updates, especially if they were installed “over the air” (OTA) with interruptions.
Signs of software failure:
The internet only works after rebooting.
- There is a network icon, but the pages are not loaded ("no Internet access").
The phone “forgets” Wi-Fi passwords or mobile settings after the update.
- 🧹 Clear the cache of the communication module: Go to Settings → Annexes → Application management → Three dots (menu) → Show system. Find Phone Services and SIM cards and mobile network (SIM Toolkit. Press Warehouse for each. → Clear the cache.
Reset the network settings
Settings → Memory and backups → Settings reset → Resetting Wi-Fi, mobile network and Bluetooth settingsRelated: Retreat of the update
MIUI
Fastboot
⚠️ Note: If after resetting the network settings, the phone stopped seeing SIM-The card at all, this may indicate damage. IMEI. In this case, repairs are required at the service center (see section 8).
Hardware malfunctions: antenna, communication module and model-specific "diseases"
If the software methods didn’t work, the problem could be physical damage to the components responsible for communication, with Xiaomi devices having a few typical “diseases”:
| Model | Typical malfunction | Signs. | Decision |
|---|---|---|---|
| Redmi Note 8/9 Pro | The heap of the antenna plume | Complete lack of network or a sharp drop in signal when pressing the back cover | Disassembly and rationing of the plume |
| POCO X3/X3 Pro | Overheating of the communication module | The Internet disappears with prolonged use or charging | Replace thermopaste, cleansing from dust |
| Mi 10/10T | RF chip defect | Network catches only near tower, frequent "failures" in 5G | Replacement of the communication module |
| Redmi A1/A2 | Weak Wi-Fi receiver | Low speed even near the router | Use of an external antenna or replacement of a module |
How to diagnose a hardware problem:
1. Check whether the signal level changes when you press the phone body (if so, the plume will likely leave).
2. Run the communication test through the engineering menu:
##4636## → Phone Information → Select SIM → View signal parametersIf the dBm value jumps between -110 and -70, it indicates an unstable antenna contact.
3. Check the phone in the anechoic chamber (or just wrap it with foil) - if the signal is lost completely, the antenna is faulty.
How to verify IMEI authenticity?
5. Firmware conflicts: global vs. Chinese version of MIUI
Xiaomi devices often come with different firmware versions – global (Global), Chinese (China) and regional (EEA, India, Russia), each with its own frequency and operator restrictions.
- 🌍 Global firmware (MIUI Global supports most European and Russian frequencies, but can block some functions (e.g., the Internet, 5G Redmi Note 11 in Russia).
- 🇨🇳 Chinese firmware (MIUI China has no frequency restrictions, but requires a link to a Chinese Mi Account and may conflict with Russian operators.
- 🇷🇺 Russian firmware (MIUI Russia) optimized for local operators, but often lags behind in updates.
How to check your firmware:
1. Go to Settings → About Phone → MIUI version.
2 If at the end of the name there is CN - it is Chinese firmware, RU - Russian, EU - European.
If your firmware doesn't match the region, it could be a cause of bad reception, so you can reflash your phone to the right version via Fastboot or Recovery, and you can use the instructions for popular models.
- Xiaomi 12/13 Series: Use Xiaomi Firmware Updater to download stable global firmware.
- POCO F3/F4: Switch through TWRP with a persist pre-backup (otherwise IMEI!).
- Redmi 9/10: MIUI EU (unofficial but stable firmware) is suitable for these models.
💡
Flashing your phone takes away the warranty and can lead to data loss. If you're not sure about yourself, contact the service.
External factors: operator, router and geolocation
Sometimes the problem isn't with the phone, it's with the surrounding infrastructure.
- 📡 Operator coverage: use coverage cards (such as RootMetrics) to check the area. 4G The 1800 MHz frequency used by many Xiaomis.
- 🔌 Router Settings: Make sure Wi-Fi is running in mode 802.11n/ac (not b/g). - Turn it off. WPA3 — Some Xiaomi models (e.g. Redmi) 8A) Do not support this protocol. - Change the Wi-Fi channel to 6 or 11 (less-loaded).
- 📍 Geolocation restrictions: if you are traveling, some operators (such as MegaFon) may block roaming for devices with unofficial firmware.
- ⚡ Electromagnetic interference: microwaves, wireless charging, or even LED-Lamps can create noise in the 2.4 GHz range, impairing Wi-Fi reception.