Some accounts ask you to install a very specific authenticator app, but for others including Google you can take your pick: The Android and iOS app stores have a number of options to pick from. Instead, you should use an authenticator app, which supplies a code via an app on your phone. But text message, or SMS, authentication is easy to hack. Many people will opt for giving the service their phone number so they can be texted a code to authenticate. If you switch on two-factor authentication 2FA on your accounts-and you really should -then you need something else besides a username and a password when you log in on a new device.
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