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> WhatsApp, Telegram and Signal use mobile phone numbers as identifiers

One notable exception (which as I understand is tptacek-approved) is Wire, which only needs an email.

I concede that Wire has essentially lifted the core crypto bones from Signal. But metadata collection is a clear distinction between Signal and Wire, so if what 'jcranmer is saying about email metadata is persuasive to you, your choice between Wire and Signal should be clear: use Signal, not Wire.

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