This official FDNY App uses multi-factor authentication. This ensures your identification is securely validated. Use the method that provides you the greatest flexibility based on your specific needs. You can receive SMS text on your personal or Department-issued (where applicable) mobile phone or cellular-connected tablet, or via email directed to a personal email account, or to a work email. Make sure to select the method that provides you with the easiest access whenever you have a need to gain enter to FDNY facilities.