Setting up 4G (LTE) on Android: a complete guide with solutions to problems

Modern smartphones Android support high-speed mobile data 4G (LTE), but sometimes users are faced with the fact that the network works in mode 3G or E, despite the operator's coverage. The reasons may be different: from incorrect settings APN to restrictions from the firmware or SIM card. In this article, we will look at all the ways to enable and optimize 4G on devices running Android 10–14, and also solve typical connection problems.

It is important to understand that the configuration algorithm may differ depending on smartphone manufacturer (Samsung, Xiaomi, Realme etc.), version Android and even model modem (for example, Qualcomm Snapdragon vs Mediatek Helio). We will look at universal methods, and also point out nuances for popular brands. If your phone does not support 4G at the hardware level (for example, older models before 2016), no settings will help - you will need to replace the device.

Before you start setting up, check two key points:

• 📶 Network coverage: make sure that your operator (MTS, Beeline, MegaFon, Tele2) provides 4G in your area. To do this, visit the official website or use the operator's application.
• 🔄 Reboot: sometimes it is enough to reboot phone or turn on/off airplane modeso that the network updates the connection parameters.

1. Checking your smartphone's 4G support

Before setting up the network, make sure your device hardware supports 4G. Even if the specifications indicate the presence of LTE, some budget models (especially those released before 2018) can only work in bands not used by your operator.

How to check:

1. Go to Settings → About phone → Characteristics (path may vary). Look for lines like Network, LTE or 4G.
2. Use diagnostic applications, for example Network Signal Guru or LTE Discovery (available in Google Play). They will show the supported bands (for example, B3 (1800 MHz) B7 (2600 MHz) Check the specifications of your model on sites like B3 (1800 MHz), B7 (2600 MHz)).
3. Check your model's specifications on sites like GSMArena or 4PDA.

Attention to the bands! In Russia operators use the following main 4G frequencies:

Operator	4G bands (LTE)	Notes
MTS	B3 (1800 MHz), B7 (2600 MHz), B20 (800 MHz)	Range B20 better penetrates buildings
Beeline	B3, B7, B20	In some regions it is used B1 (2100 MHz)
MegaFon	B7, B20, B31 (450 MHz)	B31 — for remote districts
Tele2	B3, B7, B20	Uses infrastructure Rostelecom

If your phone does not support your operator's bands, 4G will not work. For example, Xiaomi Redmi 4X (2017) does not support B20, so in areas where the operator uses only this band, the network will be limited to 3G.

2. Enabling 4G in Android settings

The easiest way to activate 4G is through the standard settings menu. The interface may differ slightly, but the general logic is the same.

Universal instructions:

1. Open Settings (gear icon in the application menu).
2. Go to section Network and Internet (or Connections, SIM cards and mobile networks).
3. Select your SIM card (if there are several).
4. Click Type network (or Preferred network type, Network mode).
5. Set value 4G (LTE), 4G/3G/2G (auto) or LTE/WCDMA/GSM.

On some firmware (for example, MIUI on Xiaomi) the path will be different:

Settings → SIM cards and mobile networks → [Select SIM] → Preferred network type → 4G

Important nuance: if there is no option in the list 4G, this may mean:

• 📵 SIM card does not support 4G (outdated format or service not activated).
• 🔧 Phone firmware limits functionality (often found on custom ROMs).
• 🛠️ Modem hardware malfunction.

Make sure that the SIM card supports 4G (USIM)

Check operator coverage in your region

Reboot the phone before changing settings

Disable VPN (it may block the connection)-->

3. Setting up APN access points

APN (Access Point Name) are parameters that determine how your phone connects to the operator’s Internet. Incorrect APN settings are one of the most common reasons for lack of 4G. Operators usually automatically send the correct APNs when you first install a SIM card, but sometimes you have to configure them manually.

How to check and change APN:

1. Go to Settings → Network and Internet → Mobile network → Advanced → Access points (APN).
2. If there are several APNs, select the one that corresponds to your operator (for example, internet.mts.ru for MTS).
3. If there is no APN, click Add and enter the parameters manually (see table below).
4. Save changes and restart the phone.

APN parameters for popular operators (2026):

Operator	Name APN	APN	Authentication type
MTS	MTS Internet	internet.mts.ru	PAP or CHAP
Beeline	Beeline Internet	internet.beeline.ru	PAP
MegaFon	Megafon Internet	internet	Not specified
Tele2	Tele2 Internet	internet.tele2.ru	PAP

If after manually entering APN 4G does not work, check whether the operator is blocking access to LTE for your tariff. For example, some corporate or legacy plans may limit the speed to 3G.

How to reset the APN to factory settings?

If you experimented with APN and now the Internet does not work, return the default settings:

1. Go to Settings → Network → APN.

2. Click on the three dots in the upper right corner and select Reset to default.

3. Reboot your phone.

If there is no reset option, delete all APNs manually and wait for the operator to send new ones (may take up to 5 minutes).

4. Using the engineering menu to force 4G on

If the standard settings do not help, you can try activating 4G via engineering menu (or service menu). This method is suitable for experienced users, since incorrect actions can disrupt the network.

Instructions for most smartphones on Qualcomm Snapdragon:

1. Open the application Phone and enter combination: ##4636##.
2. In the menu that opens, select Phone information (or Phone Information).
3. Scroll down to the block Set preferred network type.
4. Select LTE only or LTE/WCDMA/GSM auto.
5. Click Update (or Update) and restart the phone.

For smartphones on Mediatek (for example, many models Xiaomi, Realme):

1. Enter in the phone application: ##36446337##.
2. Go to Connectivity → Band Selection.
3. Select LTE and check the supported ranges (see table in section 1).

⚠️ Attention: Changing parameters in the engineering menu may lead to network loss or unstable calls. If you are unsure of your actions, skip this section. Also note that on some firmware (MIUI 14+, One UI 5+) access to the engineering menu may be blocked.

5. Solving problems with 4G: common errors and ways to fix them

Even after proper configuration, 4G may be unstable or not connect at all. Let's look at typical problems and their solutions.

Problem 1: There is a 4G icon, but the Internet does not work.

• 🔄 Check the balance and status of the service with the operator (sometimes they block access for non-payment).
• 📱 Remove and re-add the APN (see section 3).
• 🛡️ Disable VPN or antivirus - they may block traffic.

Problem 2: The phone constantly switches between 4G and 3G.

• 📶 This may be due to a weak signal. Try to force install LTE only in the engineering menu (see section 4).
• 🔋 Check if the battery saving mode is enabled - it may limit network activity.
• 📡 If the problem is only in a certain location, this may be a feature of the operator's coverage.

Problem 3: There is no 4G option in the settings.

• 🔧 Update the phone firmware to the latest version (in the settings Software update).
• 🆔 Check if yours supports 4G SIM card (USIM). Older SIMs (before 2015) may not work with LTE.
• 📲 Install alternative software (for example, Google Dialer) - sometimes the standard Phone application hides options.

⚠️ Attention: If after all the manipulations 4G still does not work, the cause may be a hardware malfunction (for example, damage to the antenna or modem). In this case, contact the service center. Diagnostics will cost 500–1500 rubles, and repairs will cost from 2000 rubles, depending on the model.

6. Optimizing 4G speed on Android

Even if 4G is connected, the Internet speed may be slow. Here are several ways to increase it:

1. Disable automatic switching to 3G/2G:

In the engineering menu (see section 4) set LTE only. This will force the phone to always use 4G, but may degrade call quality in areas with weak signals.

2. Use applications to monitor the network:

• 📊 Network Cell Info Lite —shows the signal strength and range used.
• 📈 Speedtest by Ookla —measures the actual download/upload speed.
• 🔍 LTE Discovery —helps you find the best 4G range.

3. Configure DNS:

Sometimes low speed is associated with slow operator DNS servers. Try using public DNS:

1. Go to Settings → Network and Internet → Private DNS.
2. Select Private DNS provider hostname.
3. Enter dns.google (Google) or 1dot1dot1dot1.cloudflare-dns.com (Cloudflare).

4. Disable background applications:

Some apps (for example, cloud storage or instant messengers) consume traffic in the background. Limit their activity in Settings → Applications → Permissions → Data usage.

7. Features of 4G setup on popular brands

Smartphone manufacturers often modify Androidby adding their own settings. Let's look at the nuances for popular brands.

Samsung (One UI):

• 🔄 Path to network settings: Settings → Connections → Mobile networks → Network mode.
• 🔧 In some models (Galaxy S22+, Galaxy A53) there is an option VoLTE (voice over LTE) - turning it on can improve the quality of calls.
• 📡 To force the selection of bands, use the code *#0011# (service menu).

Xiaomi/Redmi/Poco (MIUI):

• 📶 Path to settings: Settings → SIM cards and mobile networks → [Select SIM] → Preferred network type.
• 🔒 On some firmware (MIUI 13–14), the 4G option may be hidden. To return it, reset the network settings in Settings → Memory → Reset → Reset network settings.
• 🛠️ For the engineering menu, use the code ##4636## or ##36446337## (for Mediatek).

Realme/Oppo (ColorOS):

• 📱 Path to settings: Settings → SIM card and mobile data → [Select SIM] → Preferred network type.
• 🔄 In some models (Realme 9 Pro, Oppo Reno8) there is an option Dual 4G (Dual 4G) - it allows you to use 4G on both SIM cards at the same time.
• 📡 To access the engineering menu, enter *#36446337#.

Google Pixel (Stock Android):

• 🔧 Path to settings: Settings → Network and Internet → SIM cards → Preferred network type.
• 🆔 On Pixel 6/7/8 is supported 5G, but it can be disabled in favor of 4G to save battery.
• 🛠️ The engineering menu opens with a code ##4636##.

⚠️ Attention: Settings may vary depending on the firmware version and regional modification of the smartphone. If you do not find the specified item, check for system updates or contact the manufacturer's support.

FAQ: Frequently asked questions about setting up 4G. on Android

My phone shows 4G, but the speed is like 3G. What's the problem?

This may be due to several factors:

• 📶 Base station overload —during peak hours the speed drops. Try testing the speed at night.
• 🔧 Non-optimal range —your phone may connect to an overloaded band (for example, B3 instead of B20). Use the application LTE Discoveryto check.
• 📡 Operator restrictions —some tariffs have a “soft” speed limit even in 4G (for example, up to 10 Mbit/s). Check the conditions with the operator.
• 🛡️ VPN or proxy - disable them and check the speed again.

After updating Android, 4G disappeared. What should I do?

Updates sometimes reset network settings. Try:

1. Reset network settings: Settings → System → Reset → Reset Wi-Fi, mobile network and Bluetooth.
2. Delete and re-add APN (see section 3).
3. Check if not Is the forced use of LTE disabled in the engineering menu (enter ##4636##).
4. If all else fails, roll back the firmware to the previous version (if possible).

If the problem is widespread (for example, after a major update Android 14), follow the patches from the manufacturer.

Is it possible use 4G on two SIM cards at the same time?

It depends on the smartphone model:

• ✅ Support Dual 4G: Samsung Galaxy S22+, Xiaomi 12 Pro, Realme GT 2 Pro, OnePlus 10 Pro and newer flagships.
• ❌ Does not support: most budget models (for example, Redmi 9A, Samsung Galaxy A13). In them, 4G works only on one SIM, and the second switches to 3G/2G.

To check, go to Settings → SIM cards and mobile networks and see if there is an option Dual 4G or 4G/4G.

How to enable VoLTE (voice over LTE) for better call quality?

VoLTE (Voice over LTE) allows you to make calls over a 4G network, improving call quality. To enable it:

1. Make sure that your operator supports VoLTE (all major operators in Russia do).
2. Go to Settings → Network and Internet → Mobile network → Additional → VoLTE (path may vary).
3. Enable the option VoLTE calls or Improved calls.
4. Restart the phone.

If there is no option, check:

• Whether your SIM card supports VoLTE (USIM is required).
• Is the phone firmware updated to the latest version.
• Has the operator blocked the service for your tariff.

What to do if 4G only works after a reboot?

This is a typical problem associated with:

• 🔄 Unstable firmware —check for updates or roll back to the previous version.
• 📡 Bad signal —the phone loses connection to 4G and does not restore it automatically. Try to force install LTE only in the engineering menu.
• 🛠️ Hardware problems —modem or antenna malfunction. Diagnostics at a service center will help identify the cause.

Temporary solution: use the application Network Signal Refresh (available in Google Play), which forcibly updates the network connection without rebooting.