Sign-Up Verification: Email, Phone and the Second Step
Platforms ask you to confirm an email or phone number to tie an account to something that is hard to create in bulk. A second login step protects the account afterwards.
What confirmation proves
A confirmation link or code proves only that the person signing up can read messages sent to that address or number. It does not prove identity. Its purpose is to make accounts expensive to mass-produce and to give the platform a route to reach you.
Email versus phone
- Email is free to create, so it is a weak barrier against bulk registration.
- Phone numbers cost money and are limited in supply, so they are a stronger barrier. They also expose more about you, and numbers are reassigned when people change provider.
The second step at login
Multi-factor authentication asks for something beyond the password: a code from an app, a prompt on a device, or a hardware key. It means a leaked password alone is not enough to take the account.
Strength of the common options
- Codes by text message are better than nothing, but can be intercepted if someone takes over the phone number.
- Codes from an authenticator app are generated on the device and do not travel over the phone network.
- Hardware keys and passkeys are tied to the genuine site address, so they also resist imitation sites.
Recovery is part of the design
Every protection needs a way back in when a phone is lost. Save the recovery codes when they are offered, and store them somewhere other than the device they protect.
Verification also protects the community as a whole, by slowing the account creation described in why open sign-ups attract profile spam.
Last reviewed 2026-10-13