This doesn&#x27;t make a whole lot of sense because people give up their phone numbers from time to time. I did this myself. My understanding is that someone who claims my number cannot access my past data. But if it is &quot;stateless&quot; then a phone number doesn&#x27;t have to be the only identifier. They can also use email. Heck .. here is an algorithm ... use phone number 555XXXXXXX .. take a person&#x27;s email address and hash it to XXXXXXX. Done!