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Re:You can change your number by wolverine876 on Monday February 07, 2022 @05:31PM (#30252305)
Also, Signal envisions (or envisioned) contact lists as a foundation for a distributed, secure, private social network, under end-user control. It's an obvious solution once you think about it (a signal of brilliance).
Re:You can change your number by wolverine876 on Monday February 07, 2022 @10:03PM (#30254476)
For skeptics, here is Moxie talking about it:

https://signal.org/blog/private-contact-discovery/

... Signal began by using the social graph that already lives on everyone’s phones: the address book. Rather than a centralized social graph owned by someone else, the address book is distributed and user-owned. Additionally, having the social graph already on the device means that the Signal service doesn’t need to store a copy of it. Any time someone installs or reinstalls Signal, their social graph is already available locally.