Drew DeVault: I don't trust Signal drewdevault.com/2018/08/08/Sig
You should use Element (element.io) instead, which doesn't require your phone number.
The matrix.org server is overloaded and slow, but unlike with Signal (which is centralized), you can choose from many other servers, and still be able to talk to every Matrix user. server list: publiclist.anchel.nl/

@imattau Yes, you can run your server, but you won't be able to write to other Signal users. It's not federated, like Matrix and Element, which doesn't even require your phone number (element.io).