If you're using two-factor authentication — good. If your second factor is an SMS text message — you're better off than nothing, but you're using the weakest form available. Here's why, and what to use instead.
WHY SMS 2FA CAN BE BYPASSED
SIM swapping — An attacker calls your carrier, pretends to be you, and transfers your number to their SIM. Your texts now go to them. This attack is disturbingly easy against most carriers and has been used to drain cryptocurrency accounts and take over email.
SS7 vulnerabilities — The underlying telecom protocol has known flaws that allow SMS interception. Nation-state level attack, but documented and real.
Real-time phishing — Fake login pages that capture your SMS code and use it on the real site before it expires — defeating 2FA entirely.
💡 SMS 2FA is significantly better than no 2FA. If SMS is the only option, use it. But where you have a choice, use an authenticator app instead.
WHAT TO USE INSTEAD
Authenticator apps (Google Authenticator, Authy, Microsoft Authenticator) generate time-based codes locally on your device. They never travel through the phone network — immune to SS7 attacks and SIM swapping.
Hardware security keys (YubiKey) are the strongest option. Physical possession required, immune to phishing because the key verifies the website domain before authenticating.
YubiKey 5 NFC Hardware Security Key
The strongest 2FA option for supported accounts. Works with Google, Microsoft, GitHub, and hundreds of services. Immune to phishing and SIM swap.
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