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What is an authentication app?

Authentication apps generate security codes for signing in to sites that require a high level of security. You can use these apps to get security codes even if you don’t have an internet connection or mobile service.
You can set up an authentication app to generate your security code. First, you’ll need to download an authentication app to your computer or phone. After installing and configuring the application to work with, you will be able to receive security codes without a phone number. Some options for authentication apps include: