You're probably used to seeing the 5G icon at the top of your screen and feeling like you're browsing at lightning speed. However, there's an invisible danger lurking: your phone is still capable of connecting to 2G networks, a technology that's over thirty years old and, frankly, completely obsolete in terms of Android security.
The problem is that some cybercriminals exploit this vulnerability to install fake antennas that force your device to downgrade its network. By tricking your phone into thinking 2G is the only available option, they can bypass modern security measures and send you fraudulent messages that appear to be from your bank, all without your carrier's spam filters detecting them.
The big new feature of Android 17 compared to previous versions
Since Android 12, Google has allowed us to turn off 2G, but there was a problem: the user had to find the setting and manually toggle the switch. Most people don't do this because, let's face it, nobody bothers with complicated connectivity menus unless they're an expert. Android 17 solves this with a zero-click approach.
With the new update, Google will give phone companies the ability to configure devices so that 2G is disabled by default . This means the protection will be completely seamless and the user won't have to lift a finger. However, this won't be a universal feature, as it will depend on each carrier and whether they decide to implement this measure for their subscribers.
How do fake antenna attacks work?
To understand why Google takes this so seriously, we need to talk about so-called SMS Blasters or fake base stations (FBS). These devices emit a very powerful signal that tricks nearby mobile phones, forcing them to abandon LTE, 4G, or 5G networks and connect to a malicious 2G network.
The major flaw of 2G is its lack of mutual authentication. Simply put, the phone identifies itself to the cell tower, but it can't verify whether that tower is legitimate or belongs to a hacker. Once a criminal gains control, they can inject extremely convincing phishing SMS messages by modifying the sender to appear official.
Guide to manually disabling 2G right now
If you don't want to wait for Android 17 and you have a current device, you can try blocking 2G yourself by checking some options we recommend disabling on Android for security . On iPhones, this is virtually impossible, but on Android, there's a trick using the phone dialer. Just enter the code *#*#4636#*#* and go to the "Phone information" section.
Once inside, look for the "Set preferred network type" dropdown menu. Here you have several options depending on what you're looking for:
- To maintain 5G and 4G: Select NR/LTE.
- To maintain 5G, 4G and 3G: Select NR/LTE/WCDMA.
- For those who don't have 5G but want to avoid 2G: The option LTE/WCDMA It is the ideal.
It's important to remember that even if you do this, emergency calls will not be affected, as the system will still search for any available network, including 2G, if necessary to save a life.
The dilemma of the technological blackout in Spain and Europe
It's not as simple as pressing a button. 2G and 3G have been so successful that we've installed them everywhere. In Spain, there are thousands of IoT devices and M2M systems that depend on these frequencies, such as payment terminals, alarms, and smart meters. That's why many operators are shutting down 3G before 2G to avoid leaving these systems without coverage.
A critical case involves elevators and cars. Many emergency communication systems in elevators use 2G modems. Even worse is the eCall system in vehicles, mandatory in the EU since 2018 for calling emergency services (112) in case of accidents. It is estimated that there are some 64 million vehicles exposed to this technology that could be left without communication. Because changing the hardware is expensive and time-consuming, the European Commission has had to postpone the complete switch-off until 2030 to avoid chaos.
The transition to more secure networks is necessary to free up spectrum and improve 4G and 5G speeds, but it clashes head-on with the reality of millions of older devices that can't be updated with a simple software update. Meanwhile, the best defense is to reduce the attack surface of our mobile phones by disabling technologies that should no longer exist.
