How to strengthen the Internet on Xiaomi phone: from settings to hardware solutions

Weak Internet on Xiaomi is a problem that even owners of flagship models like Xiaomi 14 Ultra or Redmi Note 13 Pro+ face. Whether 4G slows down in the subway, whether Wi-Fi constantly falls off at home, or 5G works only on paper - the reasons can be both software and hardware. In this article, we will analyze all the ways to amplify the signal, from basic settings to deep technical tricks that will not be told in the communication salons.

It is important to understand that on models with a Snapdragon processor (for example, Xiaomi 13T or POCO F5), network problems are often solved by updating the radio module, whereas on cheap Redmi with MediaTek, the fault usually becomes the economy on antennas. We will not advise “just restart the phone” – here are only proven methods with an explanation of why they work.

1. Diagnostics of the problem: why is the Internet slowing down?

Before you fix anything, you need to know what the problem is, and a weak signal can be triggered by:

• 📶 Operator problems: base station congestion, maintenance or tariff restrictions (e.g., "endless internet" with trottling after 50 GB).
• 📱 Phone hardware constraints: weak antennas in budget models (Redmi A2, POCO M6), damaged SIM- trays, or oxidized contacts.
• 🛠️ Software failures: setting curves APN, outdated firmware MIUI, or conflict with VPN.
• 🏠 External interference: thick walls, neighbor routers on the same frequency, distance from the tower 4G/5G.

How to check? Go to Settings → About → MIUI version and tap 5 times on the Linux kernel, the service menu will open (does not work on all models). Select Network Testing → Signal Strength. If the RSRP value (for 4G/5G) is below -100 dBm, the signal is very weak. For Wi-Fi, see RSSI: below -70 dBm, it's time to act.

Another test: run a Speedtest and compare the speed to other devices at the same point, and if you have faster Internet on your iPhone or Samsung, the problem is your Xiaomi.

2. Optimization of mobile Internet settings (4G/5G)

To start with, the SIM- map and network settings are very simple: operators (especially Tele2 and Iota) often give out suboptimal APN settings, which means that the phone doesn't use all the available frequencies.

Open Settings → SIM- Maps and Mobile Networks → [Your SIM] → Access Points (APN). If there are multiple profiles, leave only one with your operator name. Basic settings for manual input (if automatics do not work):

If the speed hasn't increased, try to force the 4G to turn on (even if you have a 5G- tariff):

1. Enter the dialer ##4636##.
2. Select Phone Information.
3. In the Network Type Installation section, select LTE only.

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If the Internet is completely lost after changing the APN, check if the 2G mode is turned on in the SIM- card settings, a common error after the MIUI updates.

3. Wi-Fi Strengthening: From Channel Change to MTU

With Wi-Fi on Xiaomi, for example, many models (Redmi Note 12, POCO X5) by default connect to the network at 2.4 GHz, even if the router supports 5 GHz. And on a congested channel, the speed can drop by 10 times!

How to fix it:

• 🔄 Change the Wi-Fi channel in your router settings. Use applications like WiFi Analyzer to find the freest channel. 2.4 GHz is better to choose 1, 6 or 11; 5 GHz is better to choose 36, 40, 44, 48.
• 📡 Turn on 5 GHz manually: in the Wi-Fi settings on your phone tap by network name → Additional settings → Frequency range → 5 GHz.
• 🔧 Change MTU: Optimal value — 1472 (enter in router settings or via ADB-adb shell settings put global wifi_watchdog_mtu_size 1472).
• 🔒 Disable IPv6 if you are not using: in the Wi-Fi settings of the network, uncheck IPv6.

Make sure the router supports 5 GHz | Check free channels in WiFi Analyzer | Change the channel in the router settings | Turn on 5 GHz mode manually on the phone | Update the router's firmware-->

If Wi-Fi is permanently shut down or not connected, try:

1. Forget the network (Settings → Wi-Fi → [name] → Delete).
2. Turn off Adaptive Wi-Fi in Settings → Wi-Fi → More
3. Disable Smart Switching (this is a MIUI feature that automatically switches you to mobile data when Wi-Fi is weak).

4 Hardware Methods: From the antenna to the SIM- map

If the software methods didn't work, the problem could be the hardware.

1 SIM- Card and tray:

• 🔧 Check if the SIM- trays are bent. On Xiaomi 12 and newer models, the tray often breaks when sloppy extraction is done.
• 📱 Try to move the SIM- card to another slot (if there are two).Sometimes the main slot (SIM 1) catches the net better.
• 🔄 Replace SIM with a new sample nano-SIM (especially if you have an old card with cropped edges).

Antennas and hull:

• 📡 On the POCO F and Redmi K models, the antennas are located in the upper and lower parts of the body. Do not cover them with your hand or a case with metal inserts.
• 🛠️ If the phone falls, check the integrity of the antenna tracks (requires disassembly). On Xiaomi, it often leaves contact at the antenna connector near the camera.
• 🔋 The weak signal may be due to a bloated battery that is pressing the motherboard.

External antennas and amplifiers:

• 📶 For 4G/5G, an external antenna (e.g., Poynting XPOL-1) with an adapter to TS-9 or CRC-9 (depending on the Xiaomi model) can be used.
• 🔗 A signal amplifier will help if the tower is far away, but beware: cheap Chinese repeaters can degrade the signal due to interference.

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If the signal improved after replacing the SIM- card or cleaning the tray, the problem was contacts. If not, the antennas or the communication module on the board are to blame.

5. Hidden MIUI settings for the network

MIUI hides a lot of options that can be changed through the engineering menu or ADB.

1 Enable all frequencies of 4G/5G:

By default, Xiaomi can block some ranges.

adb shell


su




setprop persist.vendor.radio.add_caps 1




setprop persist.vendor.radio.atfwd_start 1




reboot

After restarting, the phone will start scanning all available frequencies.

Optimization of modulation:

From the Engineering Menu (#4636##) go to Phone Information → Network settings and set:

• Set preferred network type: LTE/TD-SCDMA/GSM/WCDMA (for maximum compatibility).
• Enable LTE only: On (if not 3G required)
• Enable VoLTE: Inc. (improving call quality and Internet stability)

3. modifying the TTL to circumvent the restrictions:

Some operators (e.g., Iota) limit speed over TTL. To trick the system, type:

adb shell settings put global captive_portal_detection_enabled 0


adb shell settings put global captive_portal_server null




adb shell settings put global captive_portal_https_url null




adb shell settings put global captive_portal_http_url null

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Before working with ADB, enable USB Debugging in Settings → About Phone → MIUI Version (stamp 7 times according to version) → For developers.

6. firmware and modifications for maximum signal

If nothing works, the firmware remains. But it's important not to overdo it.

Update MIUI:

• 🔄 Check firmware relevance in Settings → System Update. Sometimes newer versions of MIUI optimize networking for specific carriers.
• 📥 If the update is available but not installed, download the full package from the official website and swipe through System Update → Three dots → Select a file.

Castom firmware:

• 🛠️ Firmware like LineageOS or Pixel Experience often works better with networks, as they use stock Android without restrictions MIUI.
• ⚠️ But beware: on some models (Redmi Note 11, POCO X3 Pro), custom firmware can break the IMEI or communication module!

Modification of the radio module:

For advanced users, you can flash a modem (radio firmware) from another version of MIUI. For example, a modem from Xiaomi.eu often catches the network better than a stock one.

1. Download the archive with the modem (see 4PDA for your model).
2. Fly through TWRP or Fastboot.
3. Make sure to back up EFS (Folder with IMEI and network settings)!

7. Alternative solutions: VPN, DNS, proxy

Sometimes the problem isn't the signal, it's the operator lockdown or poor routing.

1 DNS:

• 🔧 In your Wi-Fi or mobile network settings, change DNS to 1.1.1.1 (Cloudflare) or 8.8.8.8 (Google).
• 📈 This can speed up the loading of sites if your carrier is using slow DNS- servers.

2.Use of VPN:

• 🔒 VPN like Warp (from Cloudflare) or ProtonVPN sometimes improves speed by by bypassing operator trottling.
• ⚠️ But some VPN, on the contrary, slow down the connection because of encryption. Test!

Proxies to circumvent restrictions:

If the operator blocks certain sites (e.g. Telegram), set up a proxy in Settings → Wi-Fi → [networks] → Additional → Proxy Server. Free proxies can be found on free-proxy-list.net, but they are often unstable.

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Changing DNS and VPN only helps if the problem is in routing, not in the signal itself.If the ping is high (over 100 ms) even with a good signal level, the operator or overloaded tower is to blame.

8. When do you contact the service?

If you've tried everything, but the Internet is still slowing down, it may be a hardware malfunction.

• 📵 The phone does not catch the network at all (even 2G).
• 🔋 After falling or getting moisture, the signal disappeared.
• 🔧 The engineering menu (#4636##) does not have IMEI or has been replaced with 000000000000000000.
• 📡 The antenna test shows RSRP = 0 or N/A.

Average cost of repair:

Before going to the service:

1. Make a backup of the data (in case of resetting).
2. Check if the warranty is valid (if the phone is warranty, do not open it yourself!).
3. Check whether the service center has experience with Xiaomi (many "universal" workshops spoil the phones of this brand due to ignorance of features).

FAQ: Frequent questions about strengthening the Internet on Xiaomi