According to The Verge, Signal now allows users to securely link multiple phones to one account, expanding on its previous support for linking PCs and iPads. Users can now add an Android phone or iPhone to their existing Signal account with a single phone number.
Multi-device on a privacy-first messenger is harder than it sounds because keys and message history have to sync without a central plaintext store, so it's worth checking how Signal handles history migration and per-device key management here. If you build encrypted apps, their approach is a useful reference for doing linked devices without weakening the trust model. For users, the practical win is a backup phone that stays in sync rather than a fresh install that loses context.
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HTSApp