Authenticator app or SMS code: what is the difference
Both are a second factor. The authenticator does not travel over a carrier network, which is why it is harder to intercept.
An authenticator app and an SMS code are both two-factor codes; the difference is who generates them - the authenticator computes one locally from a clock and a shared secret, while an SMS code is delivered over the carrier network.
Key points
Where the code comes from
An authenticator app computes the code on your device from a secret shared with the platform, so it works with no signal. An SMS code is sent to your phone number by the platform.
Why the authenticator is preferred
An SMS can be intercepted, forwarded, or taken over with a swapped SIM. The authenticator never crosses the network, so a stolen number is not a stolen code.
Common questions
Do I lose the authenticator if I change phones?
The secret lives only on the device. Export it from the old phone or re-enrol on the new one first, and keep the one-time recovery codes the platform gave you.
Can I read the code to support?
No. Anyone asking for a code, for any reason, is attacking you. Support never asks you to read one out.
Keep reading
Sources：NIST SP 800-63B, Digital Identity Guidelines（nist.gov） · The guidelines discuss the known limits of SMS codes; this page restates the conclusion · Checked on 2026-09-15
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