Have you noticed that your Xiaomi smartphone has become worse at catching the network? You can only call at the window, mobile Internet slows down, and the signal icon constantly flashes between "one stick" and "no network, POCO It could be due to hardware limitations (cheap antennas in budget models) and software firmware bugs. MIUI.
In this article, we will analyze all possible causes of a bad signal on Xiaomi – from banal wear and tear. SIM-maps to hidden modem settings. You'll learn how to amplify 4G/5G, Stabilize Wi-Fi and even improve your work GPS Most of the methods don't require root rights and run on Redmi models. 9A Xiaomi 14 Ultra.
Important: If the problem occurs after a phone drop or moisture, immediately go to the "Hardware malfunctions" section - software methods will not help here. In all other cases, start with simple steps and gradually move to more complex ones.
1.Diagnostics: how to understand what is wrong with the signal
Before trying to treat a phone, you need to pinpoint the symptoms. Bad signals on Xiaomi can manifest in many ways:
- 📶 Mobile network: often lost communication, calls are cut off, SMS come with a delay, the Internet speed is below 1 Mbps with full sticks".
- 📶 Wi-Fi: the network is constantly disconnected, the speed jumps from 100 Mbit / s to 1 Mbit / s, the router “cannot see” the phone or vice versa.
- 📍 GPS: Location is determined with an error of 50+ Meters, navigator jumps on the road.
To separate software bugs from hardware problems, perform a quick check:
- Put it in. SIM-If the signal is the same bad, the problem is the operator or SIM-map.
- Check the Wi-Fi on another device, and if the laptop/tablet is also slowing down, the router or ISP is to blame.
- Install Network Signal Info (free on Google Play) and it will show the exact dBm (signal level) values. ASU (connection quality) Normal performance: 📶 4G/LTE: from -85 dBm (good) to -110 dBm (bad). 📶 5G: from -90 dBm -120 dBm. 📶 Wi-Fi: from -50 dBm (excellent) to -70 dBm (weakly).
If the values are worse than those indicated, move to the next sections. If the signal is normal, but the Internet is slowing down, the problem may be in the following sections. DNS-servers or operator restrictions (see section 5).
2.Problems with SIM-The card: when it is not the phone's fault
Up to 30% of bad signal cases on Xiaomi are related to faulty signaling SIM-Even if the card looks normal on the outside, microcracks on the chip or wear of contacts can impair communication.
What to do:
- 🔄 Restart your phone, which is trivial but often helps, especially if the signal suddenly disappears.
- 📱 Check the slot for SIM. On the Redmi Note models 10/11 and POCO X3/X4 The tray may be a little slurring, bend the contacts in the slot carefully (for example, with a toothpick), or put a piece of paper for a tight fit.
- 🆔 Clean it up. SIM-Wipe the chip with a soft cloth soaked in alcohol. Don't use abrasive materials!
- 🔄 Change the format. SIM. If you use a nano-SIM with an adapter in a micro-SIM slot, replace it with a native nano without adapters.
- 📲 Update profile SIM. Dial it ##8695## (for MegaFon/Beeline or ##4636## → Phone information → Update profile.
If nothing helps, contact the operator for a replacement. SIM. Modern cards (especially eSIM) have better protection against interference, Tele2 And MTS is free to change. SIM contact-file.
What to do if your phone can’t see SIM-map?
3. Hidden settings MIUI signal-enhanced
MIUI It hides many useful features that can improve communication, such as the default default firmware modem shutdown, and limited frequencies. 4G/5G battery-saving.
How to enable hidden functions:
- Activate the "Only" mode 4G/5G". Go to Settings. → SIM-maps and mobile networks → [yours SIM] → Network type and select Only 4G (preferably 5G (Automation is often stuck on weak networks. 3G/2G.
- Enable "Enhanced Call" (VoLTE). In the same menu, activate the option VoLTE (voices via voices). 4G). This will not only improve call quality, but also stabilize the signal.VoNR (voice via voice) is also available on the Redmi Note 12 and later. 5G).
- Turn off traffic savings. In Settings → Battery and productivity → Traffic savings turn off this option. It limits mobile internet speed in the background.
- Use the engineering menu ##4636##, Select Phone Information and see the settings: Set preferred network type → set up LTE only NR/LTE (for 5G). Enable LTE only → Turn on (if available).
Important: on some models (e.g, POCO F3) If you change the network type, you may lose the mobile Internet in the engineering menu, in which case, restart the phone or reset the network settings.
☑️ Network optimization in MIUI
4. Software bugs: resets, firmware and patches
If the signal is missing after the update MIUI or custom firmware installations, the software is to blame:
- 📱 Redmi Note 10/11 post-update MIUI 14 (Problems with Qualcomm modem X51).
- 📱 POCO X3/X4 Android-based firmware 12+ (antenna driver conflict).
- 📱 Xiaomi 12/13 using the Global ROM (Frequency restrictions 5G).
How to fix it:
- Reset the network settings. Go to Settings. → SIM-maps and mobile networks → Reset network settings. This will delete stored Wi-Fi and passwords, but often solves modem problems.
- Reverse to the old version MIUI. If the signal is missing after the update, go back to the previous firmware via Fastboot or Recovery. 4PDA Xiaomi Community.
- For some models (e.g. Redmi Note 9 Pro), users create modem patches that improve the signal, XDA).
- Check it out. IMEI. Type *#06# and compare the shown IMEI If they're different or if they're shown null, the modem doesn't work. IMEI You can use Engineer Mode (instructions for your Google model separately).
⚠️ Attention: if after resetting or firmware, the phone stopped seeing the network at all (there is not even a "one stick"), do not try to sew the modem yourself.
💡
Before resetting your network settings, export your Wi-Fi list through the WiFi Password Viewer app (available on Google Play) so you can quickly restore connections.
5. Hardware malfunctions: when to carry in the service
If none of the software methods worked, the problem is probably the hardware.
| Component | Symptoms | Reason. | Cost of repair (₽) |
|---|---|---|---|
| antenna plume | Signal disappears when the phone is tilted, "dead zones" on the case | Breakdown after fall or wear | 800–1 500 |
| Radio module (modem) | Total lack of network, IMEI null | Overheating, corrosion, failed firmware | 2 000–4 000 |
| SIM-slot | The phone can't see. SIM Or see her once. | Oxidation of contacts, mechanical damage | 500–1 200 |
| Microphone/dynamics | You cannot hear the message, but you cannot hear it. | Pollution, contact detachment | 600–1 800 |
⚠️ Warning: If the phone has fallen into water or been hit hard, don't try to disassemble it yourself. - Xiaomi case (especially the Mi series and the slew of the phone). POCO) glued tightly, and when opened without a special tool, you can damage the antenna tracks on the board.
How to check for hardware malfunction:
- Call from your phone and slowly turn it in your hands, and if the signal goes missing in a certain position, the antenna plume is to blame.
- Light the flashlight in SIM-If you see oxidation, you need to clean or replace it.
- Does the phone heat up in the top area (where the antenna is located)? Overheating may indicate a malfunction RF-module.
If you suspect a breakdown, contact Xiaomi Service Center or a verified repair.The cost of diagnosis is usually free, and original parts for popular models (Redmi Note 10, POCO X3) low-cost.
6.Improving Wi-Fi: why Xiaomi is not catching a router
Wi-Fi issues on Xiaomi are usually related to:
- 🔄 Incompatibility of standards (for example, the router works on the 802.11ac, The phone only supports the 802.11n).
- 📶 Channel overload (many devices on the same frequency).
- 🔋 Saving energy (MIUI Limits Wi-Fi in the background).
How to fix it:
- Change the Wi-Fi channel. Run the WiFi Analyzer app on your phone and find the least loaded channel (for example, 149 for 5 GHz). Then go to the router settings and manually install it.
- Turn off "Smart Switch." In Settings. → Wi-Fi → Additionally, turn off the option Automatic switch to mobile data, which can break the connection at the slightest interference.
- Enable high performance mode. In Settings → Battery and productivity → Select Performance Mode to High Performance. This will disable Wi-Fi restrictions.
- Update the Wi-Fi driver on some models (e.g. Redmi) K40) It helps to firmware a separate Wi-Fi module. 4PDA.
If the problem is only with a specific router, try:
- 🔄 Reboot the router (turn off for 30 seconds).
- 🔄 Change the type of encryption with WPA3 on WPA2 (router-setting).
- 🔄 Disable Band Steering (if the router is dual-band).
7. Bad. GPS: How to make your navigator work more accurately
If Google Maps or Yandex.Navigator detects your location with a 50 error+ Meters or long "catch" satellites, the problem may be in the:
- 📡 Weak signal GPS (Especially in cities with tall houses).
- 📱 Incorrect settings MIUI (switched off A-GPS).
- 🔄 Outdated Almanac data (satellite database not updated).
How to improve GPS:
- Enable high-precision location. Go to Settings. → Annexes → Permits → Autorun and allow autorun for Google Play Services and Google Maps. then in Settings → Select location mode High accuracy.
- Update the data A-GPS. Install the app GPS Status & Toolbox, open it and press Manage A-GPS state → Reset, then Download. This will download the latest satellite data.
- Use an external antenna (for the car). If you need a navigator in the car, buy an external one. GPS-receiver (e.g. GlobalSat) BU-353-S4) And you plug it in via Bluetooth, and it'll give you up to 3 meters of accuracy.
- Check the developer settings. Activate Developer Mode (click 7 times on Version) MIUI in the phone settings, then in the settings → Additionally. → For developers, turn on GPSS Use Hardware.
⚠️ Attention: if GPS It doesn’t work even after all the manipulations, check the antenna plume (see section 5). on Xiaomi it often departs after falls, especially on models with a metal body (Mi 9, Mi 10).
8 Additional methods: from amplifiers to alternative firmware
If standard methods don’t help, try advanced solutions:
- 📶 Signal amplifier: You can buy a mobile phone repeater for your home or office (e.g. Huawei). B525 or TP-Link 4G+). It amplifies the operator's signal and distributes it over Wi-Fi. Cost: from 3,000 ₽.
- 📱 Castom firmware: Firmware like LineageOS or Pixel Experience often works better with modems than it does with modems. MIUI. Disadvantage: Loss of some functions (for example, IR-blaster).
- 🔧 Replace the antenna. POCO F1, Redmi Note 8 Pro and other models can be replaced by the antenna unit (cost: 300-800) ₽). Video instructions for "Xiaomi [your model] antenna replacement".
- 📡 Mesh system for Wi-Fi. If you have a Wi-Fi problem, install Mesh routers (e.g. Xiaomi Mi Wi-Fi Mesh or TP-Link Deco) that create a single network without breaks.
Extreme method (for experienced only): modem firmware through QCN-This allows you to manually adjust the antenna settings, but if you make a mistake, the phone can lose the network forever. XDA Developers.
💡
If you live in a low-cost area (e.g., out of town), no software method can replace a signal amplifier or a change of operator.