How to improve the quality of communication on Xiaomi smartphones: from network settings to hardware solutions

Weak mobile signal, call interruptions or slow internet on Xiaomi are a problem that affects one in five users of the brand. MIUI, and in the hardware limitations of a particular model (for example, the Redmi Note 10 is known for a weak module). 4G In this article, we will look at 10 proven ways to improve communication, from basic settings to advanced technical solutions, including alternative firmware and antenna modifications.

It's important to understand that there's no one-size-fits-all solution. MIUI and the region of use, for example, owners POCO F3 trouble 5G So, if you change the bandwidth, and if you're a Mi 11 Lite with a weak Wi-Fi, it's a hardware upgrade, and we structured the materials so that you can quickly find a solution to your situation without unnecessary experimentation.

1. Diagnostics of the problem: how to determine the source of poor communication

Before you start settings, you need to identify the root of the problem. Bad communication on Xiaomi can manifest itself in different ways:

• 📶 Low signal strength (1-2 division on the indicator) when in the coverage area of the operator.
• 📞 Call interruptions or inability to make an outgoing call.
• 🌐 Slow mobile Internet (speed below 5 Mbps) 4G+).
• 🔄 Constant switching between 3G/4G/5G.
• 📡 Problems with Wi-Fi/Bluetooth (frequent breaks, low speed).

For accurate diagnosis, use the engineering menu (service code ##4636##). After entering, go to the phone information section and pay attention to:

• 📊 Network type - if displayed LTE, but the speed is like 3G, frequency-problem.
• 📡 Signal level (in dBm): from -70 dB -90 dBm is normal, below -100 dBm is critical.
• 🔢 ASU — The higher the value, the better the signal (maximum 31).

Also check the coverage of the operator in your area through official maps (e.g. RootMetrics).If the problem is only seen at home, it may be the blocking of the signal by walls or interference from other devices that is to blame.

Programming methods: settings MIUI signal-enhanced

In 80% of cases, bad communication on Xiaomi is solved without disassembling the phone – it is enough to optimize the settings. MIUI. Let's start with the basic steps:

Resetting network settings

The fastest way to fix software failures is to reset the network settings to factory settings.

1. Go to Settings. → SIM-maps and mobile networks → Resetting network settings.
2. Confirm the action (you will need to enter a password or pattern lock).
3. Reboot your smartphone.

This procedure will remove saved Wi-Fi networks, passwords and settings APN, But it'll return the factory settings to the communications module, and after the reset, it's recommended that you manually configure the access points (APN) for your operator (instructions are on the sites of MTS, Beeline, MegaFon).

Optimization of network mode

MIUI The default is to automatically select the network mode, but it's not always optimal:

1. Open the Settings. → SIM-maps and mobile networks → [Choose. SIM] → Type of network.
2. If you have Xiaomi with support 5G (Like Redmi. K50 Xiaomi 13), choose 5G/4G/3G/2G (motor-car).
3. For models without 5G (Like Redmi. 9A) set up 4G/3G/2G (motor-car).
4. If the signal 4G Unstable, try to force-only 4G (switch off 3G).

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On some firmware POCO The hidden regime 4G. To activate it, enter the command in the engineering menu

setpreferrednetworktype 9

LTE-only

Frequency band settings (bands)

If your Xiaomi doesn't catch 4G/5G In a particular region, it may not support the frequencies used by the operator:

To force the required frequencies:

1. Install Network Signal Guru (available on Google Play).
2. Open the Band Selection section and select the ranges supported by your operator.
3. Save the settings and restart the phone.

Hardware solutions: from antennas to modifications

If the software methods didn’t help, the problem could be in the hardware.Modern Xiaomi smartphones are equipped with multiple antennas (usually a few antennas). 4–6 for 4G/5G, Wi-Fi, GPS), But their location and performance vary. POCO X3 Pro antennas are located around the perimeter of the body, and in Mi 11 Ultra – using a metal frame as an amplifier.

Checking the integrity of antennas

Physical damage to antennas is a common cause of poor communication after falling or disassembling the phone.

1. Remove the back cover (for removable models, such as Redmi) 9C).
2. Inspect flexible antenna plumes (usually located at the upper and lower ends).
3. Check the contacts on the motherboard – they should be clean, without oxidation.

If the antenna is torn off or damaged, it can:

• 🛠️ Re-sweetening (sweetening station and experience required).
• 🔧 And then, put it in a temporary fix).
• 📱 Replace the plume (cost 300–1000) ₽ service-centre).

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On Xiaomi models with a metal body (such as the Mi 6 or Mi 8), the antennas are integrated into the frame. ₽.

Signal amplification by external antennas

For stationary use (e.g., at home or in the office), you can connect an external antenna via an adapter. This is true for models with an antenna connector (e.g., some of the antennas that are connected to the antenna). POCO Or Black Shark. It'll take:

• 📡 Antenna with magnetic base (for example, 4G LTE MIMO 7-9 dBi amplifier).
• 🔌 Couple adapter SMA (phone-in).
• 📶 Signal amplifier (optional if the antenna is passive).

Connection diagram:

1. Attach the antenna to the adapter.
2. Connect the adapter to the smartphone (via USB-C port).
3. Place the antenna (at the window) for maximum reception.

The signal increase can reach +15 to 20 dBm, which is particularly noticeable in rural areas, but please note that this solution is only suitable for stationary use.

Check for an antenna connector on your phone|

Buy an antenna that supports your frequencies (for example, the radio, B3/B7/B20)|

Set the antenna in the place with the maximum signal|

Set up. APN manually-->

4. Alternative firmware and modifications

If your Xiaomi is working on MIUI With communication bugs, the solution may lie in changing the firmware. For example, owners of the Redmi Note 10 Pro often face the problem of a "jumping" signal. 4G on official assembly:

• 📱 MIUI EU — European version without Chinese restrictions (best compatibility with Russian operators).
• 🤖 LineageOS or Pixel Experience – “clean” Android with an optimized modem stack.
• 🔧 Castomic cores (e.g., FrancoKernel) – improve antenna power management.

Firmware process:

1. Unlock the bootloader (via the official Xiaomi tool).
2. Install. TWRP Recovery (for your model).
3. Download the firmware from the XDA-Developers forum.
4. Flow through TWRP (instructions are attached to each firmware).

Warning: Unofficial firmware may take you out of warranty and contain bugs. TWRP Or Mi Flash Tool.

5. Optimization of Wi-Fi and Bluetooth

Wi-Fi and Bluetooth issues on Xiaomi are often related to channel congestion or router settings that are incorrect, starting with basic checks:

5.1 Selection of the optimal Wi-Fi channel

If the Wi-Fi speed on Xiaomi is lower than on other devices, the problem may be the congestion of the channel.

1. Download the app from Google Play.
2. Open the Channel Graph tab.
3. Select the least loaded channel (for example, 149 for 5 GHz).
4. Set up this channel in your router’s Administrator Panel.

For Xiaomi models with Wi-Fi 6 support (e.g. Xiaomi) 12T) 80 MHz channel width and standard are recommended 802.11ax.

5.2. Bluetooth setup for stable communication

If Bluetooth devices (earphones, fitness bracelets) are permanently turned off, try:

• 🔄 Reset Bluetooth settings: Settings → Connected devices → Bluetooth settings → Reset.
• 📱 Disable Battery Saver – Energy savings limit background Bluetooth work.
• 🔧 Use the aptX codec or AAC instead SBC (headphone settings).

For devices on MIUI 13/14 There's a hidden Bluetooth Absolute Volume feature that can improve sound. To activate it, type it into the engineering menu:

setprop persist.bluetooth.a2dpsink.aac_frm_fmt 1

6.Problems with specific Xiaomi models

Some Xiaomi smartphones have system communication problems that can only be solved by updating or hardware improvements.

If your model is not in the table, check out the forums for thematic discussions:

• 4PDA (partition).
• XDA-Developers (English).
• The official Xiaomi forum.

7.External factors: how the environment affects communication

Even a perfectly configured Xiaomi can be bad at catching the network due to external interference.

Interference from other devices

Household appliances and electronics can create electromagnetic interference that degrades the signal:

• 🔌 Microwave ovens – operate at 2.4 GHz, like Wi-Fi.
• 💡 Energy-saving lamps – can create noise in the range of 800-900 MHz (frequency) 4G).
• 📺 TVs and monoblocks – their power supplies emit interference.

Decision:

• Move the router or phone away from the sources of interference.
• Use 5 GHz for Wi-Fi (less prone to interference).
• Replace the lamps with LEDs without drivers.

Architectural obstacles

Walls, glass and furniture weaken the signal.

• 🧱 Concrete wall - up -20 dB.
• 🪟 Glass with metal coating - up to -15 dB.
• 🪑 Furniture from chipboard - up -5 dB.

Advice:

• Place the router on a hill (for example, on a cabinet).
• Use Mesh systems (e.g. Xiaomi Mi Mesh Router) for a large home.
• For mobile communication, use a repeater (signal amplifier).

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In apartment buildings, the signal 4G/5G It can be weakened by repeated reflection from the walls (the "canyon effect.

8.Extreme measures: when to contact the service

If none of the methods worked, the problem may be a hardware defect.

• 📵 Smartphone does not catch the network at all (even after resetting the settings).
• 🔥 The phone overheats in the antenna area (possibly short circuit).
• 🛠️ The motherboard is visible darkening or oxidation (after moisture is ingested).
• 📡 Diagnosis shows signal level below -110 dBm.

Cost of repair in official Xiaomi services (2026):

• Replacement of antenna module – 1500–3000 ₽.
• Repair/replacement of the plume – 1000–2000 ₽.
• Diagnosis of the fee - 500-1500 ₽.
• Replacement of the modem chip – 3000-6000 ₽ (model-wise).

Before the service visit:

1. Back up the data.
2. Write it down. IMEI phone (on the case under the battery or in Settings) → The phone).
3. Check the warranty card (if the phone is warranty, repairs can be free).

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If you are denied warranty repairs because of "mechanical damage," request a written waiver stating the specific fault, often a ploy to save money.