Simplex Chat has Voice / Video calls, w/o a phone number and without any user identifiers at all
Plus you can run your own server, it's fully open source, audited, and secure/private by design.
If you want to announce something to the world, the best place is Nostr.
If you want to communicate privately, the best place is Simplex.
I'm a HUGE fan of simplex! 💯
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