You should use an authenticator application for roles that require 2FA. You can select an authenticator app from the vendor of your choice, as long it complies with the OATH TOTP standard. The following mobile phone apps are recommended:
Oracle Mobile Authenticator
Download the appropriate authenticator app for your device to get started.
The authentication application you choose must support the OATH TOTP, the IETF RFC 6238 standard. OATH is the Initiative For Open Authentication. TOTP means time-based one-time password. IETF is the Internet Engineering Task Force.
For more information, see the following topics:
If you lost your device, buy a new one, change your phone number, change your authenticator app, or change your verification code delivery method, you must reset (clear) your 2FA settings in NetSuite. See Reset Your 2FA Settings. See also If You Lost or Replaced the Phone You Use for 2FA
It is strongly recommended not to use the same device for the authenticator app, and for logging in to NetSuite.