506781—the two-factor authentication code needed to access my Dropbox account on November 15, 2015. I know because it’s still there in my SMS history, a permanent record of my accessing Dropbox from new devices. I have full iCloud history in much the same way—332486 was the code on October 4, 2014. I can see the same for Microsoft, Uber, Sony… You get the point.
As I’ve written before, SMS messaging is best avoided—it’s an archaic and unsecured platform with no place among the myriad end-to-end encrypted alternatives we can now use. If you want to message family, friends, colleagues, then skip SMS and use iMessage (blue bubbles only), WhatsApp, Signal, Telegram (albeit its encryption is more complex than the others). And while you may consider your private messages to be of little interest to others, you still seal envelopes despite trusting the postal services and