Two-factor authentication ( 2FA) is an important security tool, but if it's based on SMS , it may not fully cover you.
2FA is a method of verifying a user's identity that uses two different factors. The first factor is usually the standard password for their account. This is something the user knows and uses to verify their identity. The second factor is usually something the user has, such as a mobile phone or electronic key.
See also: Astaroth phishing kit bypasses 2FA
When the user tries to log in, they must first enter their password. The system will then send a confirmation code to the second factor, such as the user's mobile phone (sms) or an authenticator app. The user must also enter this second (one-time) code into the service to complete the login.
In this article, we will look at the main reasons why you should stop using SMS authentication and choose more secure alternatives:
1. The method is vulnerable to SIM Swapping attacks
Hackers can perform a SIM swapping attack, which is to transfer your phone number to a new SIM they control. If they do this, they will be able to obtain your verification codes and gain access to your accounts.
2. Phishing
Scammers can trick you through phishing messages and sites, stealing the codes you receive via SMS and thus bypassing 2FA protection.
SMS messages are often unencrypted and rely on the security of telephone networks and companies – which can be easily accessed by hackers.
See also: Is 2FA enough for our digital security?
Another way attackers can get into your messages is by tricking you into installing malware on your device. Once the hacker has successfully infiltrated your device, they will start looking for your stored credentials and send the information back to the attacker.
3. Delay & Unreliability
SMS may be delayed or not arrive on time due to network issues. If you are abroad or in an area with no signal, you will not be able to receive the code. As a result, you will not be able to access your accounts.
4. Electronic Fraud & Inability to Identify Sender
Criminals can spoof the number from which an SMS is sent (SMS spoofing), tricking you into entering your password on a fake site.
See also: Sneaky 2FA: New phishing kit targets Microsoft 365 accounts
What are the best alternatives?
Instead of SMS-based 2FA, opt for:
🔑 Secure your passwords with Proton Pass
Password manager from Proton — end-to-end encryption, passkeys, built-in 2FA, and monitoring for leaks of your credentials.
- ✔ Encrypted storage of passwords & passkeys
- ✔ Notification if any of your passwords are leaked (Dark Web Monitoring)
- ✔ Free version — on all devices
The link is an affiliate link — SecNews may receive a commission at no additional cost to you. It does not affect the independence of our article writing.
✅ Authenticator Apps (Google Authenticator, Microsoft Authenticator, Authy) – Provide codes that cannot be intercepted remotely.
✅ FIDO2/WebAuthn (Security Keys like YubiKey, Titan Key) – A secure method, since it requires a physical device for verification.
✅ Passkeys – A new technology that eliminates the need for passwords and 2FA codes.
If you're still using SMS 2FA, it's time to replace it with a more secure option. Threats are increasing and hackers are getting more creative. It's not worth risking your personal data when there are better solutions available.
