Signal, Matrix, Threema.
Matrix is a protocol, most popular matrix frontend app is Element.
Neither Matrix nor Threema require phone numbers and are end to end encrypted.
I encourage you to checkout https://simplex.chat as well
TSB has a group chat you can join. Simplex doesn’t even have usernames, frictionless onboarding experience. Has cool features like incognito mode which gives you a new nym for every group you join when it’s turned on, and allows you to run your own relay-like server. They’re rapidly releasing new features as well.
Link to TSB group: https://simplex.tsb.chat
TSB has a group chat you can join. Simplex doesn’t even have usernames, frictionless onboarding experience. Has cool features like incognito mode which gives you a new nym for every group you join when it’s turned on, and allows you to run your own relay-like server. They’re rapidly releasing new features as well.
Link to TSB group: https://simplex.tsb.chat
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