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

Communication problems on Xiaomi smartphones are one of the most common complaints of users: mobile Internet “slows down” in places with good coverage, Wi-Fi is constantly broken, Bluetooth headset turns off every 5 minutes, there can be dozens of reasons, from the installed firmware curve to the hardware malfunction of the antenna module, but in 80% of cases, the situation can be corrected without visiting the service center – you just need to know what settings to twist and what “chips” of the manufacturer to activate.

In this article, we will discuss all possible ways to improve communication on Xiaomi, Redmi and other devices. POCO — From basic (reboot and reset settings) to advanced (manual frequency control and replacement) SIM-And you'll also learn which models have historically suffered from "weak signal" and how this relates to savings on hardware components.

Before you start settings, make sure that the problem is not on the operator or router side. For example, if you do not have mobile Internet, check the balance, the status of services with the operator or try inserting the problem. SIM-It's the same with Wi-Fi: connect another device to the network, and if you're interrupted, it's the router, not Xiaomi.

Basic actions: reset and verification SIM-map

Start with the simplest thing: reboot your phone. It sounds trivial, but 30 percent of the time, it solves the communication problem, especially if it's a failure after a software update or a long time without turning it off. Xiaomi with MIUI has a nuance: sometimes the system forgets priority networks after sleep, and the reboot reset resets the cache of the communication module and reconnects to the base station from scratch.

If the reboot didn't help, check it out. SIM-map:

• 📱 Remove and paste back. Contacts may have oxidized or the card has shifted in the slot!).
• 🔄 Change the slot. on two-symbol Xiaomi (for example, Redmi Note 12 Pro)+) The second slot often works worse due to hardware limitations.
• 🆕 Replace it with a new one. SIM-cards (especially Mini-SIM) may not support modern communication standards (e.g., VoLTE or other electronic devices). 5G).

On eSIM-enabled models (such as the Xiaomi 13 Ultra or POCO F5 Pro), try to transfer the number to a virtual card. User experiments show that eSIM is more stable in low signal conditions thanks to an optimized authentication protocol.

⚠️ Note: Some Xiaomi (especially the Redmi A and low-end series) POCO M) the second slot hybrid - it works with either SIM-If you use a microSD, the second slot for communication will be disabled.

2. Mobile network setup: operator choice and mode

By default, MIUI selects network mode automatically, but this is not always optimal. For example, in a low 5G coverage zone, a phone can "clung" to a far tower instead of switching to stable 4G. To fix this:

1. Go to Settings. → SIM-maps and mobile networks → [choose SIM] → Type of network.
2. Instead of Auto, install 4G (preferably) or 3G only if 4G is unstable.
3. Activate the option to Enable VoLTE (if available) – this improves the quality of voice communication.

If your operator supports frequency aggregation (for example, MTS or Tele2), but the network still “brakes”, try to manually select the operator:

1. In the same menu, click Network Selection. → Manually.
2. Wait until you find the available networks and choose your carrier (even if it is already marked).
3. Confirm the connection.

On Xiaomi models 12T Pro and newer on the engineering menu (##4636##) you can turn on the option NR/LTE/UMTS Auto: This makes your phone look more active 5G-towers, but may increase battery consumption.

Select the network mode manually (not "Auto")|Activate VoLTE|Check frequency aggregation|Select the operator manually|Reboot your phone after the changes-->

3. Wi-Fi Optimization: Channel and Standard Choice

If you have a Wi-Fi problem, check first if the router is to blame. Xiaomi has a built-in network analyzer: go to Settings → Wi-Fi → Additional → Wi-Fi Analyzer. It will show which channels are less loaded. Optimal settings for the router:

• 📶 Range: 5 GHz (less interference but less range) or 2.4 GHz (better through walls).
• 🔢 Channel: Select the least loaded (e.g. 1, 6 or 11 for 2.4 GHz).
• 🔒 Channel width: 20 MHz for stability or 40 MHz for speed (5 GHz).
• 🛡️ Security: Only WPA2-PSK or WPA3 (old standards WEP tether).

On the phone itself, you can turn on the high-performance Wi-Fi mode:

1. Go to Settings → Wi-Fi → Additional → Wi-Fi mode.
2. Choose High Performance (instead of Balanced or Energy Saving).

If Wi-Fi is permanently disabled in sleep mode, turn off the optimization function:

1. Go to Settings → Battery and Performance → Battery Optimization.
2. Find the Wi-Fi app in the list and select No Limits.

4.Bluetooth problems: resetting and codec selection

Bluetooth on Xiaomi is often "glutched" due to codec conflicts or energy saving.

1. Reset Bluetooth settings: Settings → Connected devices → Bluetooth settings → Reset settings
2. Disable A2DP: In the engineering menu (#4636##) find the Bluetooth partition and deactivate the A2DP Hardware Offload – this solves the problem with the cliffs.
3. Select codecs manually: In the connected device settings (cog next to the name), try changing the Audio Quality from Auto to SBC (most stable) or aptX (for high quality).

On models with MIUI 14+, the feature “Enhanced Audio” (Settings → Sound → Improved Audio for Bluetooth) has been introduced. It reduces latency, but can cause interference on cheap headsets — try turning it off.

⚠️ Attention: POCO X3 Pro and other phones with Snapdragon chip 7xx/8xx There's a bug: when you connect to a car radio recorder, you can lose your microphone via Bluetooth. Solution: upgrade to the latest version of the firmware or use it. AUX-cable.

💡

If the Bluetooth headset doesn’t work well outside, try putting the phone on your hand (like a strap case).The person’s body shields the signal and the antenna at the top of the Xiaomi body loses touch.

5. Engineering menu: hidden communication settings

For advanced users, Xiaomi has an engineering menu where you can fine-tune communication modules to get there:

1. Open the Phone app and type ##4636##.
2. Select Phone Information (or Testing on some firmware).

Options are available in this menu:

• 📡 Network selection: Standards can be manually specified (LTE only, WCDMA only) or block certain frequencies.
• 📶 Signal Level: Shows the real value in dBm (norm: from) -70 before -100).
• 🔄 Bandlock: Some models can lock the phone at a specific frequency (it is useful if the network is constantly jumping between the two). B1 and B3).

Attention! Inexperienced users are advised not to change the settings in the engineering menu, which can lead to network loss, for example, if you manually specify the wrong frequency, the phone will stop catching the network before resetting.

Hardware solutions: antenna and firmware

If the software methods did not help, the problem may be in the hardware:

• 📡 Damaged antenna: Xiaomi has antennas around the perimeter of the body (usually in the upper and lower parts). If the phone falls or gets wet, the contacts could move away. Check if the signal improves if you slightly press the body near the camera.
• 🔋 Worn-out battery: At a charge below 15%, the phone starts to save power by shutting off some of the communication modules.Replace the battery if it's swollen or goes down quickly.
• 🛠️ Bad contact. SIM-Cards: Some models (e.g. Redmi Note 10 Pro) have a weak press SIM-The solution is to put a piece of paper under the card for better contact.

If you are sure that the problem is the firmware, try to reflash the phone:

1. Download the latest version of MIUI for your model from the official Xiaomi website.
2. Use Fastboot mode for clean installation (instructions are available on the 4PDA forum).
3. After the firmware, reset the settings.

On the models POCO F3 and Xiaomi 11T Pro after upgrading to MIUI 14 users massively complained about the loss of 5G. The solution is to roll back on MIUI 13 or wait for a patch (released in March 2026).

💡

If the signal is missing after a phone drop or moisture hits, don't try to repair yourself - contact the service.The antenna module on Xiaomi is often soldered to the motherboard, and its replacement requires a soldering station.

Previous article7 Xiaomi models with a “weak signal”: what to do owners

Some Xiaomi models have historically suffered from communication problems due to component savings, and here are the most “problematic” devices and solutions for them:

If your model is on the list, try alternative firmware (like Pixel Experience or LineageOS) that often optimizes the communication module better than stock MIUI.

FAQ: Frequent questions about communication on Xiaomi