The Twilio breach was possible because employee's phone numbers & names were in other leaks so could be cross-compared for a more effective attack. The result is other user's numbers get compromised Stop treating #phone numbers as required information - https://www.bentasker.co.uk/posts/blog/software-development/dont-require-users-to-provide-valid-phone-numbers.html https://twitter.com/signalapp/status/1559221383107854336