> SMS-based 2FA also offers a unique proposition – it enables the web service to verify the user, as well as acquire a sticky and unique user identity (phone nu

> SMS-based 2FA also offers a unique proposition – it enables the web service to verify the user, as well as acquire a sticky and unique user identity (phone number) in a single swoop. This gives the web service a reliable channel to get the user’s attention. No, just no.