Unlike the other apps listed here, Authy requires your phone number when you first set it up. We're not fans of this requirement, since we’d rather have the app consider our phones to be anonymous pieces of hardware; and some have suggested that requiring a phone number opens the app up to SIM-card-swap fraud.

2FAS doesn't need your phone number or even require you to create an online account, so it's not susceptible to SIM-swapping fraud.

select IVR State and Card Verification

1-888-741-1115

1-800-772-1213

1-800-333-1795

1-866-606-3311