Why the method matters
Multi-factor authentication adds a second step beyond your password, dramatically improving account security. But not all methods are equally strong or convenient, and choosing well matters. Any MFA is far better than none, yet the differences between methods, in how resistant they are to attack and how easy they are to use, are worth understanding so you can pick the right one for each account and situation.
SMS codes: better than nothing
Receiving a code by text message is the most common MFA method and is much better than relying on a password alone. However, it is the weakest option, because phone numbers can be hijacked through SIM-swap attacks, and codes can sometimes be intercepted or phished. SMS is a reasonable fallback where nothing else is offered, but for important accounts, stronger methods are preferable when available.
Authenticator apps: a solid step up
Authenticator apps generate time-based codes on your device without needing a network, which avoids the phone-number weaknesses of SMS. They are widely supported, free, and a solid choice for most people and accounts. Their main limitation is that the codes can still, in principle, be phished if you are tricked into entering one on a fake site, but they are a clear improvement over SMS for everyday security.
Security keys and passkeys: the strongest
Physical security keys and passkeys offer the strongest protection because they are phishing-resistant: they verify the real site cryptographically and will not authenticate to a fake one. A security key is a dedicated physical device, while passkeys build the same technology into your devices. For high-value accounts, and for people at higher risk, these are the best options, combining strong security with, in the case of passkeys, good convenience.
Practical recommendations
For personal accounts, use an authenticator app or passkeys as your default, reserving SMS for services that offer nothing else, and consider a security key or passkeys for your most important accounts like email and finance. For small businesses, prefer phishing-resistant methods, security keys or passkeys, especially for admin and sensitive access, and avoid relying on SMS. The guiding principle: use the strongest method each account supports, favoring phishing resistance.
The bottom line
Among MFA methods, SMS is the weakest but better than nothing, authenticator apps are a solid everyday step up, and security keys and passkeys are the strongest thanks to phishing resistance. Use the strongest method each account supports, especially for email, finance, and business admin access. Understanding the differences helps you choose MFA that genuinely protects your accounts rather than just checking a box.
Related on Skillo
See also: What is multi-factor authentication? Explained, What is a security key? Explained.
Sources
Published date reflects the original event date (2026-10-23). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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