For years, SMS codes have been treated as a sensible security measure.
Add a text message.
Enter the code.
Access granted.
Simple. Familiar. Widely adopted.
But familiarity doesn’t equal safety and in today’s threat landscape, SMS-based multi-factor authentication (MFA) is increasingly one of the weakest links in otherwise strong security setups.
If your organisation still relies on SMS codes to protect business accounts, it’s time to reassess.
Not because MFA is optional, but because the wrong kind of MFA creates a false sense of security.
The Problem with SMS-Based MFA
SMS MFA was never designed to withstand modern attacks. It was designed for convenience.
Unfortunately, attackers have caught up and then some.
Text messages can be:
- Intercepted through compromised networks
- Phished using fake login pages that relay codes in real time
- Hijacked via SIM swap attacks
A SIM swap attack is particularly effective. An attacker convinces a mobile provider to transfer a phone number to a new SIM. Once that happens, every security code sent by text goes straight to the attacker — often without the victim realising until it’s too late.
No malware required.
No system breach.
Just a phone call and social engineering.
From a security perspective, SMS MFA relies on something you don’t fully control: the mobile phone network and your provider’s identity checks.
That’s not a foundation to build serious security on.
Why This Matters More Than Ever
Attackers don’t target MFA because it’s weak.
They target it because it’s trusted.
Many organisations assume that if MFA is enabled, accounts are protected. In reality, attackers actively design campaigns around bypassing SMS-based MFA because they know:
- It’s widely deployed
- It’s predictable
- It’s vulnerable to social engineering
Once an attacker gets past MFA, they don’t just access an account — they gain legitimacy. From there, lateral movement, data access, and internal fraud become far easier.
MFA should stop attacks.
Not politely step aside.
What to Use Instead: Stronger MFA Options That Actually Work
Not all MFA is equal. Some methods are significantly more resistant to phishing, interception, and human error.
Here’s what modern, resilient MFA looks like in practice.
1. Phishing-Resistant MFA
Phishing-resistant MFA is designed to break the attacker’s favourite tricks.
Instead of relying on codes, it verifies:
- You’re on the legitimate website
- You’re using your registered device
- The authentication request hasn’t been tampered with
Fake login pages simply don’t work — even if a user clicks the link.
This type of MFA dramatically reduces the success of credential theft and real-time phishing attacks, making it one of the strongest options available today.
It’s security that works quietly in the background, without asking users to make perfect decisions every time.
2. Hardware Security Keys
Hardware security keys take a refreshingly simple approach:
Nothing to type.
Nothing to intercept.
Nothing to reuse.
Users authenticate by plugging in a key or tapping it against a phone. The cryptographic exchange happens directly between the device and the legitimate service.
Even if an attacker tricks a user into visiting a fake site, the key won’t respond.
From a security standpoint, hardware keys offer:
- Strong phishing resistance
- Protection against account takeover
- Minimal reliance on user judgement
They’re particularly effective for privileged accounts, administrators, and high-risk roles.
3. Authenticator Apps
If hardware keys aren’t practical for every user, authenticator apps are a solid upgrade from SMS.
Unlike text messages, authenticator apps:
- Generate codes locally on the device
- Aren’t tied to phone numbers
- Aren’t vulnerable to SIM swap attacks
Modern apps also support features like number matching, which reduces the risk of accidental approvals caused by MFA fatigue attacks.
They’re not perfect — but they’re significantly safer than SMS and far better suited to modern threats.
4. Passkeys: Moving Beyond Passwords Altogether
Passkeys represent a shift in how authentication works.
No passwords.
No codes.
No shared secrets.
Instead, access is secured using biometrics such as fingerprints or face recognition, backed by cryptographic keys stored on the user’s device.
This approach eliminates entire classes of attack:
- Password phishing
- Credential reuse
- SMS interception
For users, it’s faster and simpler.
For attackers, it’s a dead end.
The Bottom Line
SMS MFA isn’t “better than nothing” anymore.
It’s not enough.
Continuing to rely on it exposes organisations to avoidable risk, especially when stronger, more user-friendly options are readily available.
Upgrading MFA isn’t about adding friction.
It’s about removing outdated assumptions.
Tech Results: Modern MFA Without the Headaches
At Tech Results, we help organisations move away from SMS-based MFA towards stronger, phishing-resistant authentication without disrupting productivity or overwhelming users.
We design MFA strategies that are:
- Secure by default
- Appropriate to real-world risk
- Practical for day-to-day operations
If you’d like to review your current MFA setup or plan a phased move to more secure authentication, our team is ready to help.
Because security shouldn’t rely on hope or text messages.
