> But how can you be sure the number displayed on your screen in genuine? You can't. The telecom system is hopelessly insecure and shouldn't be trusted for anything more complicated than dialling the speaking clock.
There is a (set of) protocol for signing telco connections that was developed:
There is a (set of) protocol for signing telco connections that was developed:
* https://en.wikipedia.org/wiki/STIR/SHAKEN
* https://www.fcc.gov/call-authentication
Anyone in the telco space that can comment on how much this is implemented in their geographic area (US, EU, APAC, etc)?