How to improve the Internet signal on Xiaomi Redmi 9T: from settings to hardware solutions

Did you notice that the Xiaomi Redmi 9T suddenly started to lose mobile Internet or Wi-Fi is out of order? The problem of weak signal is familiar to many owners of this budget smartphone, especially in dense urban areas or on the outskirts of populated areas. Unlike flagship models, the Redmi 9T is equipped with a modest Qualcomm Snapdragon 662 module with an integrated X11 LTE modem, which does not always cope with unstable networks of operators.

In this article, we’ll look at 10 proven ways to improve your Internet signal, from MIUI software settings to hardware solutions that don’t require disassembling your phone. It’s important to understand that poor signal can be caused by both operator-side problems (such as base station congestion) and the device itself. We’ll focus on aspects that you can control yourself without having to use service centers.

1. Optimization of mobile network settings

The first thing to check is the mobile network mode. Redmi is the default. 9T It may not be the most effective protocol, especially if SIM-The map hasn't updated the configuration in a while. → SIM-maps and mobile networks → [yours SIM] → Type of network.

There are three main options available here:

• 📶 4G (preferably) - the best choice for most regions of Russia. LTE where it is available and automatically switches to 3G/2G lack of coverage.
• 📶 Only 4G — compulsory regime LTE. Suitable if you are confident in stable coverage, but can lead to a complete lack of communication in areas without a connection. 4G.
• 📶 3G/2G (Vehicles are outdated, but sometimes help if the operator has not configured roaming between standards.

Also, look at the APN setting: If you've recently changed your tariff or carrier, the APN settings may have reset to update them:

1. Go to Settings. → SIM-maps and mobile networks → Access points (APN).
2. Click on the three dots in the top right corner and select Reset to default values.
3. If this does not help, manually enter your carrier’s APN settings (you can find them on the official website).

2. Reset network settings and re-registration in the network

If the signal suddenly deteriorated after the update MIUI shift SIM-This may be a network configuration conflict, and resetting the network settings will help:

Make sure you remember your Wi-Fi passwords.

Write down the APN settings (if manually entered)

Check the balance. SIM-Cards (sometimes after reset, re-activation is required)

Keep the important ones. SMS (they can leave)-->

Instructions:

1. Open Settings → About Phone → Settings Reset → Reset your Wi-Fi, mobile network and Bluetooth settings.
2. Confirm the action and wait for the reboot.
3. After turning on the phone, manually connect to Wi-Fi and check the mobile internet.

If the reset didn't work, try a forced re-registration on the operator's network.

1. Enter the code in the phone app: ##4636##
2. Select the item Phone Information.
3. Scroll down to the Network Settings block and click Disable the radio (the phone will lose communication).
4. After 10 seconds, press Turn on the radio.

⚠️ Warning: Do not change other options in the engineering menu (#4636###) unless you are sure of their purpose.

3. Update of firmware and modem files

Xiaomi regularly releases updates for modem firmware that improve communication stability. Check the relevance of your version of MIUI:

1. Go to Settings → About the phone → System update.
2. If an update is available, install it. Please note the Notes section of the version where fixes for the mobile network may be mentioned.

If there are no updates, but the signal problem persists, you can try manually flashing modem files. This is true if you use custom firmware or have not updated your phone in a long time. For Redmi 9T, modem files are part of the official software, so it is enough:

• 🔄 Download the latest version MIUI For your model from en.miui.com.
• 📥 Install it through Settings → The phone. → Updating the system → Three points. → Select the update file.

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Before upgrading, check the firmware version in Settings → About Phone → MIUI version. If it starts on V12. or V13. and an upgrade to V14 is available, this can greatly improve the modem.

Checking the physical condition SIM-card-slot

Often the cause of a weak signal is poor contact. SIM-slot cards. 9T It's equipped with a hybrid tray that can become unstuffed or contaminated over time:

• 🛠️ Clearing contacts: Extract SIM-You can clean the card and wipe its contacts (gold stripes) with a stripe or an alcohol napkin.
• 🔄 Reinstallation: Try inserting SIM-The card to another slot (if you use two cards) sometimes the second slot has the best contact.
• 📏 Checking the tray: Make sure the tray is not deformed and tightly fixed in the phone.If it dangles, this can cause signal loss when vibrating.

If you use a nano-SIM with an adapter (for example, for a micro-SIM), try trimming the card to the desired size or replacing the adapter.

⚠️ Note: Do not use metal objects to clean your contacts. SIM-The best option is a soft eraser or a napkin soaked in isopropyl alcohol.

5. set up Wi-Fi for maximum stability

If you have problems with your Wi-Fi connection, rather than your mobile internet connection, check the following options:

It's also worth checking the Wi-Fi channel in your router settings, and if there are many networks nearby, they can cause interference. Use applications like the Wi-Fi Analyzer (available on Google Play) to find the least loaded channel.

If Redmi 9T frequently shuts off Wi-Fi while sleeping, turn off this feature:

1. Go to Settings → Wi-Fi → Additional → Connect to Wi-Fi in sleep mode.
2. Choose Always.

Hardware solutions: antennas and signal amplifiers

If software methods don't work, consider external devices to amplify the signal. The following options are suitable for the Redmi 9T:

• 📡 Outdoor antenna 4G: Connects to the phone via an adapter (requires support) MIMO, It's a Snapdragon 662, and it's effective in rural areas.
• 🔋 Signal amplifier: Installs in the home and relays operator signal, suitable for areas with very weak coatings.
• 📶 Wi-Fi Mesh system: If there is a Wi-Fi problem, mesh routers (such as Xiaomi Mi Wi-Fi Mesh) will provide stable coverage throughout the home.

A critical nuance for the Redmi 9T: this smartphone does not support external antennas directly - you will need a special adapter with an SMA or CRC9 connector that connects to the motherboard through soldering work.

If you’re often in a low signal zone, consider buying a 4G-enabled router (like the Xiaomi Mi Router 4G) that will catch a signal better than your phone and distribute it over Wi-Fi.

7.Alternative methods: disabling traffic savings before changing operator

Sometimes the signal gets degraded by the hidden constraints that either the phone or the operator imposes.

• 🚫 Turn off traffic savings: In Settings → SIM-maps and mobile networks → [yours SIM] → Save traffic – disable this option – it can limit speed.
• 🔄 Change the tariff: Some carrier rates artificially limit the priority of subscribers on the network. For example, Tele2 has tariffs of the "Mine" series have a lower priority than "My Online".
• 📡 Turn it on. VoLTE/VoWiFi: These technologies improve the stability of the communication. Activate them in Settings → SIM-maps and mobile networks → Additionally. → Challenges through Wi-Fi/4G.

If none of these methods work, the last step is to change operators, and check the coverage in your area on the maps before you do so:

• MTS coverage map
• Beeline's coverage map
• MegaFon coverage map

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Before changing the operator, try using SIM-The card of another provider on your phone is 2-3 days, sometimes the difference in quality of communication is obvious after the test.

FAQ: Frequent questions about signal improvement on Redmi 9T