Authenticator app versus SMS codes, and why SMS is weaker
Both add a second step, but they are not equally strong. Here is why we steer clients toward an authenticator app wherever the option exists.
- Understand SMS codes: a one-time code is texted to your number, which is simple but tied to your phone number rather than your phone.
- Know the weakness: SMS can be intercepted, redirected through a SIM-swap, or phished on a fake login page in real time.
- Understand authenticator apps: the code is generated on the device itself and never travels over the mobile network.
- Prefer app-based codes or push approvals when a service offers a choice.
- Keep SMS as a backup method rather than your only one, so you are not locked out if you lose the app.
- For the highest-value accounts, consider a hardware key, which is stronger again.
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