To explain what's going on here for the unaware —<p>1) Duo is a commercial service that offers multi-factor authentication through a variety of means, one of which is the Phone Call.<p>2) This site lets you register them as your Duo phone number, when demanded to do so by someone who's trying to protect your high-value access from being hijacked (such as your employer).<p>3) This site provides you a phone number that auto-accepts all Duo authentication requests, even if you're asleep, offline, or otherwise not authorizing the hacking activity.<p>4) This site has zero contact information and accountability, and could very well be backed by a black market site that offers hackers lookup access for any Duo phone number for $50/number.<p>NOTE: I, personally, would absolutely push to fire anyone I found using this, no matter where I worked.