By now you’ve probably heard you should be using two-factor authentication, often called 2FA, to log in to your accounts. If you’re using 2FA, you need an additional code to access your email, Facebook or other accounts. This is often sent via SMS, which may not be the most secure.
For instance, if you request a texted code, it could be intercepted by someone snooping on your mobile network or a hacker who has convinced a mobile operator to redirect your phone number. Further, when you don’t have cell service, you can’t get the text.