Two-factor authentication is an essential security measure that uses your phone to help prevent unauthorized access to your account. It makes it harder to access your account if you lose your phone, but that’s also sort of the point. Thankfully, you aren’t without options if you can’t find the one device you use to verify that you are actually you.Two-factor authentication, by its very nature, is designed to prevent access to your accounts if you don’t have access to your phone (or other authenticating device). Therefore, there aren’t many ways to circumvent this requirement after the fact. There are many ways to prevent this problem from happening, however. So don’t wait until you lose your phone to set them up.