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Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Chadder - Encrypted messaging app
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
GrapheneOS - GrapheneOS is an open source privacy and security focused mobile OS with Android app compatibility.
Facebook Messenger - Facebook Messenger is a faster way to message.
Earlynote - A time-travelling messaging app