Aah well you see two factor verification is this type of application that installs on a smartphone thats coupled to your login on another website, thing is, if your smartphone is reset, you can in many cases lose access to the website it opens, because it becomes a second requirement of logging in.
People take it and assume its safer, but it exposes you to the problems covered in the post, which is often left unconsidered at the time of enrolling in the feature.
See two factor authentication is not phone number centric, its linked to your software installation, which makes you vulnerable to damage, loss and some forms of sabotage.