When you send a text to someone who is not using Signal, you can invite them to get the app or simply send a message as a normal, non-encrypted SMS. The main difference is that all messages sent to Signal users in your contact list are automatically encrypted. Signal aims to replace regular SMS messenger options by giving you the possibility of sending and receiving messages in the traditional way. The app is designed to help you to keep your conversations private and it is available for Android and iOS. Launched in 2015, Signal combines the functionality of the two apps (in fact they have now become Signal), supporting secure encrypted messages and VoIP voice calls. Signal is a open source and free messenger app created by Open Whisper Systems, the same developers of RedPhone and TextSecure.
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