QuantDART provides a Time-based One-Time Password (TOTP) option for generating 2-factor authentication (2FA) codes. More 2-step verification option will be available soon.
TOTP
Google Authenticator, Authy, Duo, or similar authenticator apps provide a very secure configuration for 2FA. These do not require phone reception or internet access once set up. For more information on setting up: Managing Google Authenticator.