Buying a phone number is a distributed transaction

<p>In April, Yan, the controller at a six-hundred-person industrial equipment manufacturer, exported four thousand purchase orders for an audit. The auditor scrolled to the middle

<p>Short answer: treat a phone verification attempt as one trace that spans send, delivery, and verify, then make every transition auditable before you tune a provider or retry

<p>We added SMS verification to our app expecting it to be simple. 18 months later, I have opinions about carrier filtering, Twilio bills, and abuse bots.</p> <p>Eighteen months