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Signal is available as an Android app and an iOS app, with companion desktop apps for Linux, macOS, and Windows. Emphasis on companion: you must still register for Signal using a mobile phone. Your Signal message history is stored locally on your devices, but you can access your old messages on desktop platforms by scanning a QR code to link your device to your computer.
(Credit: Signal/PCMag)
Signal requires a phone number to sign up. Though the service does not store or share your phone number or
