What Happens If I Use Two-Factor Authentication and Lose My Phone?
by Eric Ravenscraft and David Murphy from Lifehacker on (#4STH9)

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"