You could try Session. It makes a session ID like this . This can be used to contact people or for people to contact you. I’ve used it to talk to my SO a bunch of times.
Session
ive heard briar and session are good
If you have to give up your phone number to register why would you get Signal over Telegram? All the people you aren't supposed to talk to are on Telegram and not Signal, so if you're giving up your phone number, why pick Signal? Because it's FOSS? What's the difference in outcome? Both end in a phone number request from the government that the service will comply with.
Aside from signal I would say your options are Simplex or Briar.
briar is pretty decent. no voice/video, but solid and quite private with multiple ways of getting messages out in hostile network environments.
edit to say: its also completely p2p using Tor rendezvous points with no centralization at all.
Privacy Guides
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