All you have to do is scan a QR code for the service you want to turn 2FA on for, and the app will generate a new log-in code around every 30 seconds.

I prefer the option to use an authenticator app rather than receiving codes via text message whenever possible, and so should you. The reason is simple logistics.

You can sync your authenticator codes to your Google Account and across your devices. It offers support for multiple accounts, and you can transfer accounts between devices by using a QR code.

When setting up an account that supports Google Authenticator, you can scan the QR code with LastPass Authenticator instead to store your tokens in the app. Naturally, you can also secure your ...

On your new phone's Authenticator app, tap Scan QR code. After you scan your QR codes, you get a confirmation that your Google Authenticator accounts were transferred. You can remove your exported ...

Pick the accounts you want (all) and it will generate a QR code. On the second device start google Authenticator select Transfer Accounts > Import Accounts. Scan the QR code from the first phone.