Modern mobile networks provide high data transfer speeds, but automatic selection of the communication module operating mode does not always work correctly. Users often encounter a situation where a smartphone switches to outdated 2G or 3G standards for no reason, even when in the area of reliable fourth-generation coverage. This leads to a drop in Internet speed, interrupted video calls and long loading of content, which is especially annoying when actively using navigation or streaming services.
The solution to this problem often lies in manual control of the radio module. In the operating system Android there are hidden mechanisms and special ones engineering codesthat allow you to firmly lock the device in LTE Onlymode. However, before applying radical measures in the form of entering secret combinations, it is worth considering standard setup methods that are safe for the average user and do not require deep technical knowledge.
In this article we will analyze in detail all the available methods of forced switching to 4G. You will learn which USSD commands work on different processors, how to get to the hidden service menu, and what risks are associated with constant operation in LTE-only mode. Understanding these nuances will help you optimize the operation of your gadget without the risk of losing connection.
Standard network settings in the Android menu
The first and safest step is to check the basic settings of your device. Smartphone manufacturers usually provide the user with the ability to select their preferred network type through a standard interface. To do this, you need to go to section Settings, then select item Connections or Network and Internet. Depending on the shell version MIUI, OneUI or ColorOS, the menu names may differ slightly, but the logic remains the same.
Inside in the mobile network settings section, find the item Preferred network type. Here you will be offered a list of options, among which there is usually a combination 5G/4G/3G/2G (auto). Your task is to eliminate unnecessary standards if the interface allows this. Some firmware allows you to select the mode 4G only or LTE directly from the drop-down list, which is the most preferable option for stable operation.
However, in the latest versions of Android, manufacturers often hide the option to select only one standard to avoid situations where the user accidentally disables the ability to make voice calls. If in the standard menu you see only general modes, then for more detailed settings you will need to use special codes or third-party software.
Before changing the network settings, write down the current parameter values. This will allow you to quickly return everything to how it was if, after the experiments, voice communication is lost.
Using the engineering menu through USSD codes
The most effective method of forcing 4G on is to enter special service codes into the application Phone. These commands open access to hidden Engineering menu, where advanced radio module settings are available. The codes vary depending on the manufacturer of the processor installed in your smartphone, so it is important to know which chipset is used in your device - MediaTek, Qualcomm Snapdragon or Exynos.
For devices based on processors MediaTekthat often found in smartphones of brands Xiaomi, Realme i Oppo, the most common command is ##3646633##. After entering this combination you will be taken to the menu Engineer Mode. Here you need to go to the Telephonytab, then select Network Selection. In the section Set Preferred Network Type you should select the value LTE Only. Be extremely careful: choosing the wrong parameter can lead to a complete lack of signal.
If you have a device based on Qualcomm, the code may differ. Try entering ##4636##. This universal command opens the testing menu, where you need to select Phone information. In the list that opens, find the drop-down menu Set up the preferred network type. Among the many options, find the line containing LTE Onlyand activate it. Immediately after selection, the network will reboot, and an icon should appear in the status bar 4G or LTE.
☑️ Check before entering codes
⚠️ Attention: The engineering menu is intended for service engineers. Indiscriminately changing parameters in sections not related to the network type (for example, transmitter power settings or sensor calibration) can lead to incorrect operation of the device or its breakdown.
Problems with voice communication in LTE Only mode
Activating the mode LTE Only solves the problem of Internet speed, but creates a new complexity - ability to make voice calls. In fourth generation networks, voice is transmitted either through VoLTE (Voice over LTE) technology, or the device must temporarily switch to 3G/2G for a regular call (CSFB). If you hardcode your phone to 4G-only mode and your carrier or plan doesn't support VoLTE, incoming and outgoing calls will become impossible.
When you try to make a call in this mode, you may hear a quick busy tone or see a connection error message. The subscriber on the other end of the line will also not be able to reach you, since the network will not be able to handover (switch) to 2G or 3G frequencies. This is a critical point that is often forgotten by users looking to maximize file download speeds. You can check support VoLTE in the SIM card settings or by checking this information with your mobile operator.
In some cases, even if there is VoLTE support from the operator, the smartphone may not activate this function automatically. Then in the same engineering menu where you selected the network type, you need to find the checkbox VoLTE Enabled or Enhanced 4G LTE Mode and force it to activate. Without this step, the mode LTE Only will turn your smartphone into a full-fledged tablet with Internet access, but without the phone function.
Why does the connection disappear when making a call?
In classic 4G networks, the channel is used only for data. Voice requires a switching channel. If VoLTE is not enabled, the phone tries to “fall” into 3G. In the “4G Only” mode, it is prohibited from falling, so the call is dropped.
Third-party applications for network management
If entering USSD codes does not produce results or the engineering menu is blocked by the manufacturer (which is often found in global firmware versions), specialized applications from the store come to the rescue Google Play. One of the most popular and reliable tools is the utility Force LTE Only (4G/5G). Such apps use system APIs to change the settings of the radio module, essentially doing the same job as manually switching in the service menu, but through a more intuitive interface.
After installing the application, you will need to give it the necessary permissions to control the phone. In the main menu of the app there are usually two methods of operation: Android Method and App Method. The first option is preferable for modern versions of Android, as it opens the standard system testing menu (##4636##), where you can safely select the desired mode. The second method tries to apply the settings directly, which does not work on all devices.
Using third-party software has its advantages: you can quickly create profiles and switch between them. For example, you can create a “Speed” profile with a mode LTE Only for downloading files and a “Calls” profile with an automatic mode for everyday use. This eliminates the need to enter long codes each time or delve into the depths of system settings.
| Application name | Compatibility | Main function | Requires Root |
|---|---|---|---|
| Force LTE Only | Android 6.0+ | Switching network modes | No |
| NetMonster | Android 5.0+ | Monitoring and cells | No |
| Network Cell Info | All versions | Signal diagnostics | No |
| 4G Switcher | Android 8.0+ | Fast 4G switch | Sometimes |
Features of operation on different processors
The architecture of the mobile chipset directly affects the availability of certain commands and the stability of operation in the mode LTE Only. Devices based on MediaTek traditionally are more responsive to user interventions and have an open engineering menu by default. The commands for them are universal and work on the vast majority of models, from budget to flagship.
The situation with processors Qualcomm Snapdragon is more complicated. Depending on the regional firmware version and carrier policy, access to the menu 4636 may be blocked. In such cases, the command ##4636## simply does not cause any action. Sometimes it helps to install an application Activity Launcherthrough which you can manually launch the hidden activity of the system test, but this requires some skill.
Smartphones from Samsung with processors Exynos have their own specific codes, for example *#2263#, which opens the Band Selection menu. Here you can not only select the type of network, but also disable specific frequency ranges that create interference or overload the airwaves. This is an advanced level of configuration that allows you to achieve maximum signal stability in difficult reception conditions.
The success of using commands depends not only on the phone model, but also on the Android version and the specific firmware build. What works on one device may be blocked on another.
⚠️ Attention: On some smartphones, after a reboot, the engineering menu settings are reset to factory values. If the “4G Only” mode disappears after turning off the phone, the procedure will have to be repeated.
Alternative methods and hidden capabilities
In addition to the classic codes, there are lesser-known ways to influence the communication module. In some firmware (especially custom ones, like LineageOS or xiaomi.eu) in the advanced settings of the modem there is an item Network preference, which duplicates the functions of the engineering menu, but is located in the safe settings section. It is also worth paying attention to airplane mode: briefly turning airplane mode on and off sometimes causes the phone to reconnect to the tower in the 4G standard, if the signal there is stronger.
For advanced users who have root access, editing system network configuration files is available. By changing parameters in files like build.prop or using a terminal with superuser rights, you can set LTE priority at the system level. The command su in the terminal allows you to execute a script that blocks registration in 2G/3G networks. However, this method is extremely risky and is not recommended for ordinary users due to the high probability of error.
Sometimes the problem lies not in the phone, but in the SIM card itself. Older cards from several years ago may not work correctly on modern networks or may not support the VoLTE profile. In this case, no commands will help. The only solution is to replace the SIM card with a new one at your operator's store, which is often free and takes a few minutes.
If you often move between areas with different coverage, use the Airplane Mode widget on your desktop. Fast switching helps you quickly catch the 4G network when entering the city from the suburbs.
Frequently asked questions (FAQ)
Is it safe to constantly keep the phone in LTE Only mode?
Technically, this is safe for the smartphone itself and does not lead to overheating or wear out of the battery. However, this can be inconvenient for the user, since if there is no 4G coverage, you will be left completely without communication. In addition, 4G networks may be congested in some areas, and switching to 3G could provide a more stable, albeit slower, Internet. Why is the code not working on my phone?
Why code ##4636## doesn't work on my phone?
Manufacturers often block access to this menu in global firmware versions or at the request of telecom operators. Try using third-party activity launcher apps or look for a specific code for your phone brand (for example, the codes are different for Samsung or Huawei).
Does the “4G Only” mode affect battery consumption?
Yes, it can. If you are on the edge of the coverage area, the phone will constantly search for a 4G signal and will not be able to “fall” to the longer-range 2G. This forces the radio module to operate at increased power, which speeds up discharge. In the area of reliable reception, the difference in energy consumption is minimal.
Is it possible to enable 4G for only one SIM card?
In most cases, network settings are applied globally to the device's radio module. If you have a dual-SIM phone, then choosing a mode LTE Only will affect both cards. The implementation of separate settings depends on the specific phone model and Android version, but is extremely rare.
What to do if the Internet is lost after turning on the mode?
Check the access point (APN) settings. Sometimes when changing the network type, Internet access settings are reset. Go to the mobile network settings, select your SIM card, find the “Access Points (APN)” item and reset them to default settings or enter the data manually, taking it from the operator’s website.