Redmi smartphones often face an obsessive problem: the device constantly “jumps” between communication standards, trying to catch a faster signal where there is none. Owners of the Redmi 9T model are no exception, and for many users, the automatic network selection mode becomes a source of irritation, as the phone can go to 2G or 3G at the most inopportune time.
Switching the device to forced LTE Only mode allows you to lock the connection at the frequencies of the fourth generation. This not only stabilizes the data rate, but in some cases has a positive effect on autonomy, as the communication module stops wasting energy on the constant search for alternative towers. However, the standard Android settings menu hides this option from the eyes of the average user.
To access Xiaomi’s hidden engineering features, we’ll need to use a system testing app or third-party utilities. Below, we’ll detail secure LTE-only activation methods that don’t require superuser (Root) rights or cause a loss of warranty.
Why do you need LTE Only on Redmi 9T?
The main reason users are looking for a way to only put 4g on the Xiaomi redmi 9t is because of the instability of carrier coverage. When a smartphone is at the edge of 4G coverage, it starts frantically switching to 3G or even EDGE, at which point the Internet connection is interrupted, and open pages or streaming videos freeze.
Forced fixation on LTE forces you to ignore older, but “prehensive” communication standards. If you’re in a 4G-confident zone, but the phone still resets the connection, manually choosing the type of network often solves the problem, and this is especially true for online gaming sessions, where ping is more important than absolute speed, and disconnection is unacceptable.
⚠️ Attention: Forced incorporation of the regime LTE Only can cause total loss of voice communication if your carrier does not support VoLTE (Voice over) technology. LTE) In that case, no incoming calls will come in.
There are also use cases where Redmi 9T is a modem or telemetry collection device in places where 3G is congested, where a stable 4G channel allows more predictable application performance, and it is important to understand that this mode of operation is diagnostic, but when used correctly, it has real benefits in everyday use.
Preparing a smartphone before changing network settings
Before you make changes to the radio module, you need to make sure that the system is ready to manipulate, Basic training will eliminate most errors and allow you to understand whether your system supports your computer. SIM-The first step is always to check the status of VoLTE with your operator.
Make sure that the service is activated on the SIM card 4G/LTE. This can be done through the operator’s personal account or sending USSD-Without an active service on the provider side, any settings in the phone will be useless. MIUI up to the latest available version, as new builds often correct modem errors.
☑️ Checking before setting up the network
If you switch your phone to 4G Only in an area where LTE coverage is not physically available, Redmi 9T will write “No Network” and will not be able to receive calls or SMS. So make sure to check before you leave the house if you have returned the settings to automatic mode.
Method of activation through the engineering menu (code 3646633)
The most common way to access hidden radio settings is by using a special engineering code, which works on many MediaTek processors that are installed in the Redmi 9T. However, it is worth considering that in new versions of the MIUI shell, access to this menu can be blocked by the manufacturer.
To start, open the standard Phone app. In the dial box, you need to type ##3646633##. If the code is entered correctly and supported by your firmware version, the screen will change and you will see a menu called Engineer Mode. If nothing happens, then access is closed, and you need to move to the next method.
##3646633##Once you're in the menu, go to the Telephony tab, then select Network Setting. You're interested in Network Selecting. From the list that opens, look for Set Preferred Network Type. Open the list and select LTE Only. After you select, press Set Selected or just go back, settings are automatically applied.
What if the code doesn't work?
Setup via menu SIM-maps and mobile networks
The standard MIUI interface allows you to manage your preferred network type, although it does not give you a hard “4G Only” fix. This method is secure and does not require special codes. It is suitable for users who simply prioritize 4G without completely turning off the possibility of 3G rollback.
Go to your Redmi Settings 9T. Find the section SIM-maps and mobile networks. Select the SIM card you want to configure the Internet for (usually this is the SIM card). SIM Click on Network Type or Preferred Network Type.
In the list that opens, select Preferably LTE. This will force the phone to search for a fourth-generation network first and switch to 3G only if the LTE signal is completely lost. This is a compromise option that provides stability, but retains the ability to voice over 3G/2G in the absence of VoLTE.
| Setup parameter | Description of action | Impact on communication |
|---|---|---|
| LTE is preferred | 4G priority, rollback to 3G/2G | Stable communication, voice working |
| LTE Only (Engineering) | 4G, and ignoring others. | Risk of voice loss, high ping |
| 3G/2G (Auto) | Ignoring 4G networks | Saving charge, low speed |
Importantly, after choosing the preferred network type, it can take the phone 10 to 30 seconds to restart the radio module and log in again. Don't panic if the network icon disappears for a short time - this is the normal behavior of the system when changing parameters.
Use Force LTE Only (4G/5G)
If standard methods don’t give you a hard fix, specialized applications from the Google Play Store come to the rescue. One of the most popular and proven solutions is Force LTE Only (4G/5G), which uses the Android system API to change the modem settings that are hidden in the regular menu.
Download and install the app. When it first starts, it will request permission to use Special App Access, a necessary step, because the app must emulate clicks in hidden system windows. The resolution is safe if the application is downloaded from an official store.
⚠️ Warning: After using third-party applications to change the type of network, sometimes you need to restart your smartphone to work properly.If the Internet did not appear immediately, try turning on and off flight mode.
In the application interface, select Method 2: Android 11+ (All Android versions) or Method 1, if the first one doesn't work. Press Set or Force LTE Only. You'll see the "Select your preferred network type" pop-up. In the list, find and select LTE Only. Ready, now your Redmi 9T is exclusively 4G.
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If after applying the settings through the application, the 4G icon disappeared and the inscription “No network” appeared, then there is no LTE coverage in your current location. Return the settings to “Preferred to LTE” or move to the confident reception zone.
Returning to the factory network settings and fixing problems
There are times when, after experimenting with settings, the network stops working correctly, or the phone gets stuck in search mode, in which case you need to reset the network settings, which will not delete your personal files, photos or contacts, but will clear the stored Wi-Fi passwords and Bluetooth settings.
To perform the reset, go to Settings → Connection and Sharing (or “Additional Settings”). Find Reset Wi-Fi, mobile networks, and Bluetooth. Click Reset and confirm the action with a password or pattern lock.
After the reboot, the smartphone will return to the factory parameters of reception of the signal. If the problem with the "jumping" of the network persists, perhaps it is a physical problem. SIM-Try to remove the tray, wipe the SIM card contacts with a soft cloth and insert it back in. Make sure the card is not damaged or older. 5-7 In the past, SIM cards may not work properly with current standards. 4G.
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Network reset is a secure procedure that often resolves communication module software conflicts without the need for a complete flashing of the device.