United
Travel · united.com
Four second factors on offer: approval in an app, text message, phone call and email code. The strongest is approval in an app.
Recommended setup
United App
Approve sign-ins in the service's own app. Only ever approve a request you just started.
PushApproval in an appUnited App
SMSText messageSupported
CallPhone callSupported
EmailEmail codeSupported
Not offered: security key, authenticator app, hardware token.
Switch it on
General steps; menu names vary. United's own guide has the exact screens.
- Sign in to United and open your account's security settings. Look for two-step verification or two-factor authentication. United's help pages show the exact screens.
- Install United App on your phone and sign in. Turn on sign-in approvals when it asks.
- Save the backup codes. Keep them in your password manager or print them; they're your way back in if you lose your phone or key.