Which only proves your comment&#x27;s parent&#x27;s point even more.<p>{SWAT, pizza orders, etc} assume that the phone number that shows up on caller ID is authentication of the identity of the phone line on the other end. They could call back the number on caller ID to verify the original caller matched the person who picked up, but they don&#x27;t.<p>Having knowledge of a Social Security number was assumed to be authentication, but it&#x27;s increasingly obvious that such an authentication scheme is antiquated and was destined to fail from the beginning. When an identity thief can get a mortgage under my name with little more than credit bureau data on me, it costs only a little more than $15 to destroy my credit, my time, and my future because transactions don&#x27;t have sufficient authentication.<p>These awfully designed authentication schemes will only magnify the problems as more companies (especially credit bureaus and data marketers) pass around data on me and make it easier for someone to buy it on demand.