Modern smartphones, by default, tend to connect to the fastest available network, which is most often 4G (LTE). However, in real life, high-speed Internet is not always a good thing. In remote areas, outside the city or in buildings with thick walls, the fourth generation signal may be unstable, which leads to constant disconnections and the inability to make even a regular call.
It is in such situations that the user has to think about how to switch from 4g to 3g on Android manually. Forced change of network mode to 3G (WCDMA/UMTS) often provides more stable coverage and high-quality voice communication, albeit at the expense of data transfer speed. This solution is also relevant for saving battery power, since the constant search for a weak LTE signal consumes energy much more actively.
In most cases, changing the network type is done through the standard settings of the device, but the interface may differ depending on the model and version of the operating system. Below we will analyze in detail all available switching methods, including hidden engineering menus for advanced users.
⚠️ Attention: The settings interface may differ slightly on smartphones from different manufacturers (Samsung, Xiaomi, Huawei). If you do not find the item you need, check for system updates or look for a similar menu in the “About phone” section.
Why do you need to switch to a 3G network
The main reason why smartphone owners are looking for a way to limit the operation of the modem to the third generation standard lies in the physics of radio wave propagation. The signal 3G has better penetrating ability through obstacles compared to high-frequency waves LTE. If you are in a basement, in an elevator, or in a rural area, the phone may constantly “jump” between 4G and 2G, completely losing connection.
Fixing on one standard allows you to stabilize the connection. You will stop losing data packets during video calls or sending messages in instant messengers. In addition, many telecom operators still use 3G networks as the core infrastructure for voice calls (CSFB), and forced switching can speed up dialing.
Another important factor is energy efficiency. When a smartphone is on the edge of the 4G coverage area, its radio module operates at maximum power, trying to maintain a connection with the tower. This leads to rapid heating of the case and discharge of the battery. Switching to 3G only or 3G/2G reduces the load on the communication processor.
Standard method through Android settings
The safest and easiest method of changing the network type is available to every user without the need to obtain root access or install third-party software. Smartphone manufacturers have included this function in the settings menu, although sometimes you have to search quite deeply for it. The algorithm of actions may vary, but the general logic remains the same for the entire ecosystem Android.
First, open the main settings menu of your device. You need to find the section responsible for wireless connections. On different firmware it may be called differently: “Connections”, “Network and Internet”, “Mobile network” or “SIM cards and mobile networks”. Use the search in settings if you cannot find the desired item visually.
After entering the mobile networks section, find the item Network type or Preferred network type. By clicking on it, you will see a drop-down list of available modes. Here you need to select the option that contains a mention 3G, WCDMA or UMTS, but excludes LTE or 4G. Often this item is called “3G only” or “3G/2G (auto).”
☑️ Network switching algorithm
After selecting a new mode, the connection will be interrupted for a few seconds and then restored. In the status bar next to the signal level, instead of the icon 4G or LTE the icon 3G or H+should appear. If the icon does not appear, try turning “Airplane Mode” on and off to reboot the radio module.
Using the engineering menu to change the mode
If the standard settings of your smartphone do not allow you to select a specific network type (which is often found on custom firmware or with some operators), you can use the hidden engineering menu. This tool is intended for developers and service engineers, so you need to handle it with care.
To enter the menu, you need to open the “Phone” application (dialer) and enter a special code. The most common code for devices on processors MediaTek — ##3646633##. For processors Qualcomm code is often used ##4636##. After entering the last digit, the menu should open automatically.
In the interface that opens, go to the tab Phone Information (Phone information). Find the drop-down list with the name Set Preferred Network Type. This list contains many technical abbreviations. You need to find and select an option that corresponds only to the third generation of communication.
- 📶 WCDMA Only — forced mode only for 3G networks.
- 📶 GSM/WCDMA — automatic selection between 2G and 3G (recommended option).
- 📶 LTE/TD-SCDMA/GSM — mode with 4G priority (current state).
- 📶 NR/LTE/GSM/WCDMA —mode with support for 5G and all previous standards.
⚠️ Attention: Do not change the settings in other tabs of the engineering menu (for example, CDS Information or Hardware Testing) if you are not sure of your actions. This may lead to incorrect antenna operation or loss of IMEI.
What to do if the code does not work?
If entering the code does not open the menu, your carrier or manufacturer may have blocked this function. In this case, try installing the Engineering Mode Shortcut application from the Play Market store, which creates a shortcut to enter hidden settings without entering codes.
Setting specifics on popular brands
Different smartphone manufacturers organize the structure of the settings menu differently. Understanding these differences will help you find the right switch faster. Below is a table with paths to network type settings for the most popular brands on the market.
| Brand | Path to settings | Item name |
|---|---|---|
| Samsung | Settings → Connections → Mobile networks | Network mode |
| Xiaomi / Redmi | Settings → SIM cards and mobile networks → SIM selection | Network type |
| Huawei / Honor | Settings → Mobile network → SIM 1 | Preferred type networks |
| Realme | Settings → Mobile network → SIM card selection | Preferred network type |
On smartphones Samsung with the One UI shell, the item is often hidden inside a submenu, and access to the full list of standards sometimes requires the use of engineering code *#2263#. In the menu that opens, you need to select Band Selection, then click PCCPCH Band and select bands corresponding to 3G (usually Band 1, 5, 8).
Devices from Xiaomi with MIUI or HyperOS shell usually have more open access to settings. However, in some regions (for example, in the China version), the items may be named differently. If you cannot find the setting, make sure that an active SIM card is inserted, since without it the mobile networks menu is often inactive.
If you have a dual-SIM smartphone, the network type setting must be applied for each SIM card separately. Often, users change the settings only for the main SIM card, forgetting about the second, which is why the phone still tries to use 4G on the second slot.
The impact of the switch on speed and battery charge
The transition to a third-generation network inevitably entails a decrease in the maximum theoretical Internet speed. If in networks LTE the speed can reach hundreds of megabits per second, then in 3G it rarely exceeds 10-20 Mbit/s under ideal conditions. This is quite enough to watch videos in Full HD or listen to music, but downloading heavy files will take longer.
But the gain in autonomy can be significant. A radio module operating in 3G mode consumes less energy with a stable signal, since it does not need to constantly scan the airwaves in search of 4G towers. This is especially true for older smartphones, the battery of which has already lost some of its capacity.
It is also worth considering that some modern tariffs and operator services are optimized specifically for 4G. When switching to 3G, the traffic route may change, which in rare cases affects the ping in online games. However, for voice calls over VoLTE, switching to 3G means returning to regular telephony, which may reduce sound quality, but will increase connection reliability.
⚠️ Attention: 3G networks are gradually being phased out in many countries around the world. Before you permanently switch to this standard, check with your telecom operator to see if there are plans to shut down 3G towers in your region in the near future.
Possible problems and solutions
Sometimes after manually switching the network mode, the smartphone stops seeing the SIM card or loses the signal altogether. This may be due to the fact that there is simply no coverage in the selected 3G frequency range in your area. In this case, the phone will endlessly search for the network, which will lead to rapid discharge.
If you are faced with a lack of connection, first of all return the settings to the mode LTE/3G/2G (auto). If the problem persists even after returning, perform a network settings reset. This action will delete saved APN access points and Bluetooth settings, but will return the radio to factory settings.
To reset, go to Settings → System → Reset settings → Reset Wi-Fi, mobile data and Bluetooth settings. Confirm the action and reboot the device. After turning on, the phone will automatically select the optimal communication parameters from the operator.
If after all the manipulations the connection is not restored, the problem may not be in the settings, but in a physical malfunction of the antenna or the SIM card itself. Try installing the SIM card in another phone to check.
Frequently asked questions (FAQ)
Why does my phone constantly switch between 3G and 4G?
This happens when you are on the edge of the coverage area. The smartphone tries to maintain fast 4G, but due to a weak signal it switches to more stable 3G. To stop this, you need to manually fix the network mode, as described in the instructions above.
Does switching to 3G affect the quality of voice calls?
In most cases, the quality of calls becomes more stable, since 3G networks are better at breaking through walls. However, support for HD voice (VoLTE) may disappear, and the sound will become normal, like in old phones.
Is it possible to enable 3G for only one SIM card?
Yes, in the mobile network settings you can select a specific SIM card and change the preferred network type for it. The second SIM card can remain in 4G mode, if it is supported by your device.
Will the Internet work after switching to 3G?
Yes, the Internet will work, but the speed will be lower. Sites will load more slowly and videos may require reduced playback quality. Messengers and mail will function without problems.