Permanent 4G on Android: how to fix the network and avoid switching to 3G

Modern smartphones Android often automatically switch between networks 2G/3G/4G, trying to save battery power or adapt to coverage conditions. However, for many users, stable 4G is not a luxury, but a necessity: online games, video calls, high-quality streaming or working with cloud services require maximum speed. Unfortunately, even with a good signal, the device can “roll down”, especially when moving or with a weak reception level. 3G, especially when moving or with poor reception.

In this article we will look at all working methods of forced fixation of the 4G network —from standard settings Android to hidden engineering menus and third-party applications. It is important to understand that not all methods are universal: their effectiveness depends on the smartphone model, firmware version and even telecom operator. For example, on Samsung Galaxy with a shell One UI the path to the network settings will be different from the "clean" one Android on Google Pixel.

Before proceeding with the settings, check two key moment:

1. Make sure that your tariff supports 4G (some operators have speed or technology restrictions).
2. Update your smartphone firmware - in new versions Android network errors are often corrected.

1. Standard Android settings: fixing 4G without root

The easiest way to make your smartphone hold 4G is to use the built-in system options. Unfortunately, not all manufacturers leave this opportunity “in plain sight”. Here's where to look for it on different devices:

On pure Android (for example, Google Pixel, Nokia, Motorola):

1. Open Settings → Network and Internet → Mobile network.
2. Select Network type (or Preferred network type).
3. Set Only LTE or 4G (preferred).

On smartphones Samsung (shell One UI):

1. Go to Settings → Connections → Mobile networks.
2. Tap Network mode.
3. Select LTE/3G/2G (auto) → then go back and turn on the switch Only LTE (if available).

On devices Xiaomi, Redmi or POCO (shell MIUI):

1. Open Settings → SIM cards and mobile networks.
2. Select SIM card → Network type.
3. Install 4G (preferred) or Only 4G.

⚠️ Attention: On some firmware the option LTE only may be missing. In this case, try the alternative methods from the following sections.

2. Engineering menu: hidden network settings

If the standard options do not help, you can turn to engineering menu the hidden settings section, where low-level parameters of the communication module are available. Be careful: incorrect changes here may disrupt operation network!

To open the engineering menu:

1. Open the application Phone.
2. Enter the combination: ##4636## (for most devices) or ##197328640## (for Samsung).
3. Select Phone information or Service Mode.

In the menu, find the section Set preferred network type (or similar). Here you can manually specify:

• 📶 LTE only — forced 4G (recommended).
• 📶 LTE/WCDMA auto — 4G/3G with 4G priority.
• 📶 WCDMA only — only 3G (not suitable for our task).

⚠️ Attention: On some devices (Huawei, Honor) the engineering menu can be blocked. In this case, try third-party applications from the next section.

What to do if the engineering menu does not open?

On some firmware, access to the engineering menu is disabled. An alternative is to use applications like MTK Engineering Mode (for processors). MediaTek) or Network Signal Guru (requires root).

3. Applications for fixing 4G: top 5 utilities

If manual settings do not work, specialized applications will come to the rescue. We have selected 5 proven utilitiesthat will help you fix a 4G network without root access (except for one case).

Application	Does root required?	Features	Link
Network Signal Speed	❌ No	Shows the current network type, allows you to manually select LTE only (on some devices).	Google Play
4G LTE Only Mode	❌ No	Creates a shortcut for quickly switching to the mode 4G only (does not work on all firmware).	Google Play
Network Cell Info Lite	❌ No	Displays detailed information about the network, helps you choose the optimal base one station.	Google Play
MTK Engineering Mode	❌ No	An analogue of the engineering menu for smartphones on MediaTek (for example, Xiaomi Redmi).	Google Play
Network Signal Guru	✅ Yes	Allows you to manually block 2G/3G bands, requires root or ADB commands.	4PDA

🔹 Tip: Before installing applications, check the reviews - some utilities may not work on new versions Android 13/14.

4. ADB commands: forced 4G for advanced

For users who are ready to dive into technical details, there is a way to fix 4G via ADB (Android Debug Bridge). computer.

📌 Step-by-step guide:

1. Turn on Developer mode (tap on Build number on Settings → About phone).
2. Activate USB debugging in the developer menu.
3. Connect your smartphone to the PC and open the command line (Windows) or terminal (macOS/Linux).
4. Enter the commands:

   adb shell
   su
   setprop sys.usb.config rndis,diag,adb

   (if root is required, use adb root before command).

5. For forced 4G, do:

   adb shell am start -n com.android.settings/.Settings\$NetworkDashboardActivity
   adb shell settings put global preferred_network_mode 9

   (value 9 corresponds LTE only).

⚠️ Attention: Incorrect ADB commands can disrupt the operation of the communication module. If after executing the command the network is lost, reset the network settings or return the value preferred_network_mode to the original (usually 10 for LTE/3G/2G auto).

5. Problems with operator: what to do if the network “jumps”

Sometimes the reason for switching to 3G is not the smartphone, but telecom operator policy. Here are typical scenarios and their solutions:

• 📡 Tariff limitation: Some operators (for example, Tele2 on old tariffs) artificially limit 4G after exhaustion of high-speed traffic. Solution: update the tariff or activate the "Maximum speed" option.
• 📡 Poor coverage: If there is a weak 4G signal in your region, the smartphone will switch to 3G for stability. Check the operator's coverage map (for example, MTS or MegaFon provide such data).
• 📡 Roaming: When roaming, some operators force subscribers to switch to 3G. Check the conditions with your provider.

🔹 How to check:

1. Call the operator (for example, *111# for MTS) and check whether your tariff supports permanent 4G.
2. Insert the SIM card into another smartphone - if the problem persists, the operator is to blame.

⚠️ Attention: Network settings may be reset after updating the firmware or changing the SIM card. Check them regularly!

6. Alternative solutions: if all else fails

If all of the above methods do not work, consider radical measures:

• 🔄 Reset network settings: Go to Settings → System → Reset → Reset network settings. This will return all communication settings to factory settings, but will delete saved Wi-Fi passwords.
• 📱 Firmware with 4G support: On older smartphones (for example, Samsung Galaxy S5) you may need custom firmware (for example, LineageOS) with an updated modem.
• 🛠️ Replacing the communication module: In rare cases, the problem lies in the hardware (for example, a damaged modem). This is true for devices after a fall or moisture.

📌 Last chance: If your smartphone supports dual-SIM, try using a second SIM card from another operator with better 4G coverage. Some users solve the problem by combining cards MTS (for 4G) and Tele2 (for calls).

FAQ: Frequently asked questions about fixing 4G on Android

❓ Why does the smartphone switch to 3G, even if the 4G signal is good?

This can happen for several reasons:

1. In the network settings, Auto is selected (3G/4G).
2. The operator limits 4G on your tariff.
3. Battery saving mode is enabled (it often turns off 4G in the background).
4. The smartphone firmware contains a bug (relevant for some models Huawei and Honor after sanctions).

❓ Is it possible to fix 4G without root?

Yes, in most cases. Try:

• Standard network settings (section 1).
• Engineering menu (section 2).
• Applications like Network Signal Speed (section 3).

Root will only be required for deep changes (for example, blocking 2G/3G bands via Network Signal Guru).

❓ Why did the 4G network disappear after updating Android?

Firmware updates sometimes reset the modem settings or make changes to the network management policy Solutions:

1. Return the network settings to factory settings (Settings → Reset).
2. Check if new options have appeared in the menu Network type.
3. If the problem persists, roll back to the previous firmware version (requires unlocking the bootloader).

❓ How to check that the smartphone really works in 4G?

Several ways:

• Look at the network indicator in the status bar (there should be an inscription 4G or LTE).
• Use the application Network Cell Info Lite —it shows the network type and speed in real time.
• Perform a speed test (for example, via Speedtest). In 4G, the speed usually exceeds 10 Mbit/s.

❓ Is it harmful to keep your smartphone constantly on the 4G network?

Short answer: no, if the coverage is stable. However, there are nuances:

• ⚡ Battery consumption: 4G consumes more energy than 3G, especially with a weak signal.
• 📶 Heating: With poor coverage, the modem works at the limit, which can lead to overheating.
• 🔄 Automatic switching: When moving (for example, in a car), constant 4G can lead to connection interruptions, since the smartphone does not have time to switch between towers.

🔹 Recommendation: If you do not actively use the Internet (for example, at night), switch to 3G/4G auto to save battery.