Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
StealthChat - StealthChat is Encrypted, Private, Secure Calls and Chats on Android and Apple iOS
Dingtone - Dingtone is a free call and texting application for making unlimited calls and text messages to any number at the moment registered in any part of the world by any cellular company.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
TextMe - TextMe is a free calls and messaging application at both local and international levels.