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SIGNAL APP
iOS and Android
Available on iOS and Android, send messages and make calls when both parties are connected to the Internet.
Signal, a secure app from Open Whisper Systems, is endorsed by Edward Snowden.
Whisper Systems co-founder Moxie Marlinspike built Open Whisper Systems using software from his former company.
It’s a blend of the encrypted RedPhone VoIP app and TextSecure SMS app, both from Whisper Systems, which was bought and dismantled by Twitter in 2011.@Jack
Call using Signal – but your friend also has to be using Signal.
Verify that the call is secure. This is done by each party being sent the same pair of words that they can verify with the other party by reading them aloud once they’re on the call. To place a call, tap the name of the person you want to call and then tap the phone icon. The phone will ring and the words will appear at the bottom of the screen.