Signal - end to end encryption communications app

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The EFF is promoting this app:

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Signal is a free and open-source application for Android, iOS, and desktop that employs end-to-end encryption to keep communications safe. Signal has certified to courts that it only maintains two types of user data available to law enforcement: timestamps of when each account was created and the date that each account last connected to the Signal service.

As with most chat apps, communications can be made between either individuals or a group, allowing you to send end-to-end encrypted text, picture, audio and video messages, as well as live video and audio calls. Everyone must have the Signal app installed to communicate with each other. Encrypted calls and messages use your data connection, so both parties in the conversation must have internet access on their mobile devices.
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More:

How to: Use Signal

Download location: Google Play Store, Apple App Store System requirements: Android 5 or later, iOS 13 or later Version used in this guide: Android: 7.0. iPhone: 7.0 License: GPLv3 Level: Beginner Time required: 15-20 minutes Other reading: https://signal.org/ https://support.signal.org/...

ssd.eff.org