Many users of modern smartphones do not think about what communication technologies are running in the background of their device until they encounter problems with low Internet speeds or data vulnerabilities. The outdated standard GSM, also known as 2G, is still supported by most mobile devices to provide basic communication in areas of poor coverage. However, the use of this protocol in 2026 carries certain security risks and reduces the overall efficiency of the communication module.
Disabling the second generation of cellular communications is often required to force the device to switch to faster and more secure networks 3G, 4G (LTE) or 5G. This is especially true in large cities, where operators are actively redistributing frequency resources, as well as to protect against specific traffic interception attacks that are possible in old-style unencrypted networks. The process of changing network priorities does not require obtaining root access and can be performed through the standard settings menu or special engineering codes.
In this guide we will analyze in detail all the available ways to limit the operation of the radio module. You will learn how to find hidden parameters in the system Android, what changes will occur after disabling legacy protocols, and how to make sure that your smartphone operates exclusively in secure data transfer mode.
Why is it necessary to disable legacy networks
The main reason for the refusal of support 2G lies in the security architecture of this standard. The encryption protocols used in first- and second-generation networks have been broken for years, theoretically allowing attackers to intercept voice calls and text messages. A forced ban on connecting to these towers forces the phone to look only for modern signals with strong encryption.
In addition to security issues, there is the issue of battery efficiency. When a smartphone is in an area where the signal is 4G unstable, it can constantly “jump” between standards, trying to maintain a connection. This creates additional load on the processor and radio module, leading to accelerated battery drain. Fixing at high frequencies helps stabilize power consumption.
⚠️ Attention: Complete shutdown of all networks except 4G/5G may lead to loss of communication in areas where modern coverage is not available (basements, rural areas, remote routes). Make sure your location has a strong LTE signal before applying these settings.
It's also worth noting the impact on data transfer speeds. If the phone is stuck in E (EDGE) or G (GPRS) mode, loading web pages and working with messengers will become almost impossible. Manually setting the network type ensures that the device will not degrade to minimum speeds even with a temporary deterioration in signal quality.
Standard method through the settings menu
The simplest and safest method of changing the preferred network type is built into the operating system interface. Smartphone manufacturers such as Samsung, Xiaomi or Google Pixel, the corresponding menu items may be named differently, but the logic of action remains the same for the entire ecosystem Android.
First, you need to go to the connection settings section. Typically this path looks like this: open Settings, find Connections or Network and Internet, then select Mobile network. In some firmware, for example on the base MIUI, this section may be hidden inside the menu SIM cards and mobile networks.
Inside the specified section, look for the option responsible for the type of network. It may be called Preferred network type, Network mode or Network standard. By clicking on this item, you will see a list of available options. Your task is to select a mode that does not contain a mention 2G or GSM at the beginning of the priority list.
- 📱 Choose options marked LTE or 5G as the main standard.
- 🚫 Avoid "2G Only" or "2G/3G" modes if your goal is maximum speed.
- ⚙️ If the "4G/LTE Only" option is available, use it to firmly fix the standard.
After selecting a new mode, the phone may lose the signal for a few seconds, and then reconnect to the nearest cell operator tower operating in the specified range. In the status bar, instead of the icon E or G indicators should appear H+, 4G or 5G.
☑️ Checking network settings
Using the engineering menu for advanced users
If the standard menu does not provide the required flexibility or hides the ability to completely disable 2G, you can use the hidden engineering menu. This interface is intended for testing equipment and allows you to control the parameters of the radio module at a deeper level. It is accessed through a set of special codes in the “Phone” application.
The most universal code for devices on processors MediaTek is ##3646633##. For devices based on Samsung the combination #0011# or #2263#is often used. It is important to understand that dialing these codes on some models may be blocked by the manufacturer or carrier, especially on devices purchased in the USA.
After entering the menu, you need to find the section related to radio frequency settings. It is usually called BandMode or Band mode. In the list that opens, you will need to select a SIM card slot (if there are two) and change the checkboxes in the list of supported standards. Uncheck items GSM 900 and GSM 1800, leaving active only WCDMA (3G) and LTE (4G).
⚠️ Attention: Careless changes in parameters in the engineering menu can lead to complete loss of connection. Remember the original settings or take screenshots before making changes so that you can return everything as it was.
Some smartphone models require confirmation of actions with a button Set or Apply after changing the configuration. After applying the settings, the phone will automatically reboot the radio module. If the connection is lost and not restored, there may be no 3G/4G towers in your coverage area, and you will need to temporarily return GSM support through the same menu.
What to do if the code does not work?
If typing the code does not open the menu, try installing the Engineering Mode application from the Play Store. However, please note that on new versions of Android, access to the equipment may be limited by a security system.
Comparison of communication standards and their characteristics
Understanding the difference between generations of cellular communications helps you take an informed approach to setting up your smartphone. Each subsequent generation offers not only higher speeds, but also improved mechanisms for protecting transmitted information. Below is a comparative table of the main characteristics.
| Standard | Maximum speed | Encryption | Relevance |
|---|---|---|---|
| 2G (GSM/EDGE) | up to 0.38 Mbit/s | Weak (A5/1) | Outdated |
| 3G (UMTS/HSPA) | up to 42 Mbit/s | Average (KASUMI) | Supported |
| 4G (LTE) | up to 1 Gbit/s | High (SNOW 3G) | Main standard |
| 5G (NR) | up to 20 Gbit/s | Very high | Prospective |
As can be seen from the table, the transition from 2G to LTE increases the potential data transfer speed by thousands of times. Moreover, encryption algorithms in modern networks make it much more difficult for third parties to intercept traffic. That's why disabling legacy modes is a smart digital hygiene measure.
However, telecom operators are in no hurry to completely disable 2G towers, as they provide coverage in the most remote corners and support the operation of older IoT (Internet of Things) devices. The user must balance between security and communication availability depending on his tasks.
If you often travel abroad, check the roaming agreements of operators. In some countries, 3G networks have already been disabled, and the phone will only be able to operate in 2G or 4G mode.
The influence of settings on the operation of applications and calls
Disabling second generation communications may affect the operation of voice calls, especially if your operator or region has not yet implemented the technology VoLTE (Voice over LTE). In traditional networks, voice is transmitted over 2G or 3G channels. If you disable these standards and VoLTE is not activated, the phone may simply not make calls, remaining in “Data Only” mode.
Modern smartphones and operators are massively switching to voice transmission over the 4G network. To make sure that turning off 2G won't prevent you from making calls, check your VoLTE settings. Usually this switch is located in the same section Mobile network and is called VoLTE calls or Advanced LTE calls.
Messengers and browsers, on the contrary, will only benefit from such changes. Eliminating slow communication channels will prevent applications from freezing when trying to load content. You will notice that video calls in WhatsApp or Telegram will become more stable, and web pages will open instantly, without long waits for switching modes.
In rare cases, banking applications may require a stable, secure connection. Working through an unencrypted 2G channel sometimes raises suspicions among the security systems of fintech services. Forced use of 4G eliminates this risk factor and ensures correct operation of two-factor authentication.
⚠️ Attention: Settings interfaces and available functions depend on the Android version and the manufacturer's shell. If you do not find the described items, check the information in the official help of your device model, since the menu location may differ.
The main condition for stable communication after turning off 2G is active support for VoLTE technology by your operator and tariff plan.
Solving possible connection problems
After making changes to the network settings, users may encounter a situation where the phone shows “No network” or the search icon. Most often, this means that there is no coverage of the standard you have chosen in the current location. For example, you selected “Only 4G”, but you are in an underground passage where only 2G is available.
In this case, you need to temporarily return automatic network selection or allow 2G/3G. Go to the network type selection menu and set the mode Auto (2G/3G/4G). This will allow the phone to connect to any available tower. As soon as you leave the poor reception area, you can re-activate the restrictions.
Another common problem is frequency incompatibility. A smartphone imported from another country (such as the US or China) may not support the 4G frequencies used by local operators. In this case, disabling 2G will result in the device being completely inoperable on mobile networks. Check your model specifications before hard tuning the bands.
If the problem persists even in a good reception area, try resetting the network settings. This action will not delete your personal data, but will return all connection settings to factory defaults. The path to this function usually lies through Settings → System → Reset settings → Reset Wi-Fi, mobile network and Bluetooth settings.
Frequently asked questions (FAQ)
Is it safe to disable 2G on the old one smartphone?
Yes, it is safe from the point of view of system integrity. However, an older smartphone may not support modern encryption standards or 4G frequencies, which will result in loss of connection. Make sure that your device is technically capable of working in LTE networks.
Will this affect the cost of the tariff?
No, changing the network type on the device itself does not affect the operator's tariff. You pay for the consumed traffic or minutes according to your tariff plan, regardless of which standard (3G or 4G) the data is transmitted through.
Is it possible to disable 2G for only one SIM card?
Yes, in most dual-SIM devices, network settings are applied individually for each slot. When selecting a network type, the system will prompt you to indicate which SIM card (SIM 1 or SIM 2) the changes are applied to.
Why does the phone still switch to E?
If you selected the "Auto" mode, the phone will switch to E (2G) when the 4G signal is lost. To avoid this, you need to select the "4G/LTE Only" mode, but remember the risk of complete loss of connection in areas without LTE coverage.
Do you need root access to disable 2G?
In most cases, no. Standard Android settings or the engineering menu are enough to control the preferred network type. root access is required only for deep modification of system files if the manufacturer has completely blocked these functions.