How to set up 4G Xiaomi: From check-up SIM-maps before manual settings APN

You bought a new smartphone Xiaomi, inserted SIM-support-card 4G, But the internet only works. 3G Or is it missing? Or when the firmware updates, the badge is gone. LTE? This problem is familiar to many owners of Redmi devices, POCO Mi — even flagship models sometimes lose their network due to tweaks, operator errors, or software bugs. 90% of the time, the decision takes no more than 5 minutes, if you know where to look.

In this article, we will discuss all possible causes of absence. 4G — From the banal (mobile internet turned off) to the hidden (firmware incompatibility with operator frequency ranges), you will learn how to check the network support of your model, where to find the right settings. APN, And what to do if your smartphone sees the network, but it's slower than you'd expect, and for advanced users, manual setup instructions. NV-Memory through the Engineering Menu.

If your Xiaomi is released before 2017 (for example, Redmi 4X or Mi 5), it may not support modern 4G bands in Russia. Check this in the specifications on the GSMArena website - look for LTE band lines and compare with the frequencies of your operator (MTS, Beeline and MegaFon they are different!).

1. Checking the basic conditions for 4G operation

Before you dig into the settings, make sure the problem isn't external factors. Here are the minimum requirements for stable operation LTE:

• 📶 Network coverage: 4G You can check the coverage maps (MTS: link, Beeline: link).
• 💳 SIM-map: must be nano-SIM (or eSIM for new models) and support 4G. Older cards (issued before 2015) can only work in the 3G.
• 📱 Smartphone model: even budget Xiaomi of recent years (for example, Redmi) 10A or POCO M4 Pros support 4G, But check the specifications.
• 🔄 Tariff plan: for some operators (for example, Tele2) 4G It can be disabled by default. Check it in your personal account or through the USSD-squadron#.

If at least one item is not met, setting up a smartphone will not help. For example, Xiaomi smartphones for the Russian market (with the prefix RU in the model) by default include all frequency ranges, but if you bought a device for China (CN), you may need firmware with support for local networks.

⚠️ Note: If you use two of these SIM-map, 4G It will only work on one of them (usually on the other hand). SIM1). To change priority, go to Settings. → SIM-maps and mobile networks → Preferred network.

2. Enable 4G in Xiaomi Settings

The most common reason for not having LTE is that your network settings are down, and here's how to check them:

1. Open the settings (cog icon on the desktop).
2. Go to section. SIM-maps and mobile networks (on some models - Mobile network).
3. Choose yours. SIM-card (if two of them).
4. Click Network Type (or Preferred Network Type)
5. Set the 4G (preferably) or LTE/WCDMA/GSM value.

If there is no such item, then your firmware does not support manual switching, in which case try to update the software (more about this below) or use the engineering menu:

Enter the dialer: ##4636###


Go to the tab "Phone Information"




In the "Install preferred network type" section, select LTE only

After you change your settings, restart your smartphone. If 4G never comes, move on to the next step.

3.Configure APN access points

Incorrect APN (Access Point Name) settings are the second most common cause of 4G issues. Operators update these settings regularly, but smartphones don't always pull them up automatically. Here's how to set up APNs manually:

1. Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Access points (APN).
2. Click on the three dots in the top right corner and select the New Access Point.
3. Fill in the fields according to your operator’s data (see the table below).
4. Save the settings and restart the phone.

If the APN is not activated after saving (the gray circle next to the name), try:

• 🔄 Remove all other access points, leaving only one.
• 📱 Restart your phone in Safe Mode (press the power button) → Restarting in Safe Mode).
• 🔧 Reset network settings: Settings → System system → Resetting settings → Resetting mobile network settings.

⚠️ Attention: On some firmware MIUI (particularly custom APN-If the Internet is not working, set a value. IPv4/IPv6.

The name field is filled in without errors |

APN introduced in lower case |

The authentication type corresponds to the operator |

The Proxy and Port fields are empty (unless otherwise indicated)-->

4. Update of firmware and modems

Outdated software is a common cause of network problems. Xiaomi regularly releases updates that fix modem errors (especially for models with MediaTek, such as the Redmi Note 11 or POCO X3 Pro).

1. Go to Settings → About the phone → System update.
2. Click Check Updates and wait for the search to be completed.
3. If you have an update, download it and install it (preferably via Wi-Fi).

If automatic updates don’t help, try manual installation:

• 🌐 Download the latest firmware for your model from the official website MIUI Downloads.
• 📁 Move the file to the phone’s root folder (not to the folder!).
• 🔄 Go to System Update. → Three points. → Select a firmware file.

For advanced users, if 4G is gone after the upgrade, try to roll back to the previous version of the modems.

1. Download the archive with the modem (see 4PDA or XDA-Developers forums).
2. Fastboot commands fastboot flash modem NON-HLOS.bin

💡

If the smartphone gets worse at catching the network after the upgrade, try resetting the network settings (Settings → System → Resetting → Resetting the mobile network settings). This often helps with conflicts between new modems and old settings.

5. Frequency range check and engineering menu

If your Xiaomi doesn’t catch 4G in some places (such as the subway or in the country), the problem may be incompatibility of frequencies. For example, Redmi 9A does not support the B20 (800 MHz) band, which is actively used by Tele2 in the regions.

• 📄 On FrequencyCheck, enter a phone model).
• 🔧 Through the engineering menu: ##4636## → Phone information → Network information.

If your carrier uses a range that the phone doesn’t support, there are two solutions:

1. Change the operator (for example, from Tele2 to MTS, if you have Redmi 8A).
2. Manually set priority frequencies through the engineering menu (for advanced ones only!):

Enter the dialer: ##4636###


Go to “Phone Information” → “Install preferred network type”




Select "LTE only"




Return to the main menu of the engineer, select "MTK Settings" → "BandMode"




Check the ranges supported by your operator (for example, for MTS: B3, B7, B20)




Save and restart the phone

⚠️ Attention: Incorrect settings in the engineering menu can lead to total loss of the network. If you are not sure, do not change the settings that you do not understand.

6.Iron problems: antenna, SIM-tray, modem

If the software methods didn't work, it could be the hardware, and here are the typical symptoms and solutions.

For self-diagnosis:

1. Check the status. SIM-- I'll put it in another phone. 4G It works – the problem with your Xiaomi.
2. Look at this. SIM-tray: bent contacts or oxidation can cause network loss. Clean them with a lasticle or alcohol.
3. Check the temperature of the phone: if it overheats, the modem can automatically slow down. Use the AIDA64 app to monitor.

If you suspect an antenna malfunction, try a signal test:

• Install Network Signal Guru (for Qualcomm) or MTK Engineering Mode (for MediaTek).
• Look at the signal strength (RSRP): if it is below -110 dBm, the communication will be unstable.
• Compare the numbers with another phone in the same place.

💡

If 4G is lost after a fall or moisture, don’t try to disassemble the phone yourself — contact the service. Damage to antenna plumes is often invisible to the naked eye, but leads to complete loss of the network.

7. Alternative ways to accelerate 4G

If 4G works but the speed is poor, try these methods:

• 🚀 Turn off automatic network selection: go to Settings → Mobile network → Select your network and manually select your carrier (e.g, MTS-RU instead of automatic).
• 📵 Turn on flight mode for 30 seconds, then turn off - this will reset the connection to the tower.
• 🔗 Use it. VPN: Some operators are throttling traffic. VPN (Cloudflare's Warp can bypass restrictions.
• 🔄 Change. DNS: customized APN Specify 8.8.8.8 and 8.8.4.4 (Google) DNS) or 1.1.1.1).

For Xiaomi owners on Qualcomm Snapdragon (like POCO F3 or Mi 11), there’s a hidden setting that can improve the signal:

Enter the dialer: ##36446337##


Select "LTE Band Selection"




Check all the ranges supported by your operator




Save and restart the phone

If nothing works, check if you have a speed limit on the tariff. For example, MegaFon, after exhausting high-speed traffic, the speed drops to 64 kbps.

8.When to contact the service center

If you've tried all the ways, but 4G never worked, you may need professional intervention.

• 🔧 The phone doesn’t see any network (even if it’s not a network). 2G).
• 📡 The signal level in the engineering menu shows NULL or Unknown.
• 🔥 The phone gets overheated when you try to connect to the 4G.
• 💥 After falling or getting moisture, mobile Internet disappeared.

The service center will check:

• Integrity of antenna plumes (a common problem after changing the screen).
• Modem performance (e.g. Qualcomm X55 in Mi 10)
• The presence of corrosion on the board (relevant after moisture hits).

The cost of diagnosis in official Xiaomi services usually does not exceed 500-1000 rubles. If the problem is in the iron, repair can cost 1500-5000 rubles (depending on the model).

⚠️ Warning: Before visiting the service, back up the data and reset the phone to factory settings. This will eliminate software errors and speed up the diagnosis.

FAQ: Frequent questions about 4G on Xiaomi