StealthChat is an industrial strength chat and phone call app for professionals that value real privacy and security. StealthChat uses advanced end to end encryption to ensure that only the sender and recipient have access to the content of the message or phone call.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
TextMe - TextMe is a free calls and messaging application at both local and international levels.
Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.