Signal is a free and open source software application for Android, iOS, and Desktop that employs end-to-end encryption, allowing users to send end-to-end encrypted group, text, picture, and video messages, and have encrypted phone conversations between Signal users. Although Signal uses telephone numbers as contacts, encrypted calls and messages actually use your data connection; therefore both parties to the conversation must have Internet access on their mobile devices.
Now, I don't suggest that Signal should be the only secure messaging app that you use, but it absolutely should be one of the secure messaging apps that you have installed on your smartphone and desktop. Signal is well-proven and highly secure. It is cross-platform, so whether you use Android, iOS, or the Desktop application you have secure communications.
Signal, the secure messaging app: a guide for beginners
12 Signal App Tips for Secure Chats
Introduction to Signal Private Messenger (Video 16:25 min)
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