- The 2G network is vulnerable to fake antenna attacks and fraudulent SMS due to its outdated encryption.
- Android 12 and later versions include a direct switch to block this connectivity.
- There are hidden system codes that force the use of modern networks on devices without the adjustment button.
You're probably used to bragging about the speed of 5G or the stability of 4G, but there's a small detail that goes unnoticed on most current smartphones: 2G is still there, lurking in the background. Although it might seem like a relic from the 90s that was only good for sending SMS messages and making basic calls, this technology is still active on our devices and can become a serious security vulnerability if we're not careful.
The problem isn't that the network is slow, but rather that it's an outdated protocol not designed to combat today's cybercriminals. That's why both Google and various cybersecurity experts recommend turning off 2G . This isn't paranoia, but a preventative measure to avoid our phones being tricked by malicious devices that force them to "travel back in time" to steal our information.
The real danger: Fake antennas and SMS blasters
To understand why we should turn off this feature, we need to talk about so-called Stingrays or SMS Blasters . These are basically fake base stations, portable antennas that anyone with a little know-how and some money can buy online. The trick is simple but effective: the attacker deploys their antenna in a busy area and emits a signal that simulates a modern network, but as soon as your phone tries to connect, it forcibly downgrades it to 2G.
Once your phone connects to the scammer's 2G network, security is lost. Unlike modern networks, 2G lacks mutual authentication , meaning your phone can't verify whether the cell tower is legitimate. Furthermore, its encryption is so weak that breaking it is incredibly easy with today's computing power. This allows criminals to inject fraudulent SMS messages that appear to be from your bank or a courier service, bypassing your carrier's spam filters and landing directly in your inbox.
Does it help save battery?
Some people think that disabling 2G will stop your phone from consuming energy, but let's be honest: the savings are negligible . It's true that you prevent the device from using a few milliamps when it scans frequencies in areas with poor coverage, but it's not going to make your battery last hours longer. If you really want to save energy, it's much more effective to lower the screen brightness or close apps that are running in the background without you noticing.
Steps to disable 2G on Android
The good news is that Google has implemented a straightforward solution starting with Android 12. Although the menu may vary slightly depending on your phone's brand, the process is usually as follows:
- Open the menu Settings or Settings.
- Look for the section Network and Internet or Connections.
- Enter the section Mobile network or SIMs.
- Locate the switch Enable 2G service and turn it off.
If you have an iPhone, unfortunately Apple doesn't offer a manual switch to disable 2G, so iOS users can't make this adjustment natively. On the other hand, some Android users (like those with Samsung and One UI) find that their phones only allow them to choose the automatic 5G/LTE/3G/2G mode without being able to disable the last link.
The hidden menu trick for advanced users
If your phone doesn't have the "Allow 2G" button in the normal settings, don't give up. There's a hidden test menu that lets you force the network type. To access it, open the phone app and dial the following code: *#*#4636#*#* . This will open a secret menu where you should go to "Phone information" and look for the " Set preferred network type" dropdown menu.
This is where the magic happens. Depending on what you want, choose one of these options:
- If you want 5G and 4G only: select NR/LTE.
- If you want 5G, 4G and 3G: select NR/LTE/WCDMA.
Remember that NR is 5G, LTE is 4G, and WCDMA is 3G . By choosing any of these combinations without the word "GSM," you'll be excluding 2G entirely and will better understand what the baseband version is on mobile phones.
What happens if I turn it off? Will I lose coverage?
In the vast majority of cases, you won't notice any difference. These days, it's very rare to find a place with only 2G coverage, unless you're in a very remote rural area or a very deep basement. The only real downside is that, in those specific locations, you might lose the ability to make calls or send SMS messages. However, there's a crucial point: emergency calls usually continue to work even with 2G disabled, as the Android system is designed to prioritize vital safety above any user settings.
Why does 2G still exist in Spain?
You might wonder why they don't just shut it down. The reason is that thousands of IoT devices , such as alarms, payment terminals, and smart meters, only operate on 2G. Furthermore, the eCall system in cars requires this coverage due to European regulations. Operators like Movistar, Orange, and Vodafone already have plans for the complete shutdown, although the most likely date for total extinction is around 2030.
Disabling 2G is essentially adding an extra layer of protection to our privacy against interception attacks. Even if technology advances and operators eventually shut down these obsolete networks within the next decade, taking the initiative now drastically reduces the attack surface for cybercriminals and ensures our smartphones aren't vulnerable to old tricks like fake cell towers.
