The signal is an encrypted mobile messaging app for Android and iOS that lets you send end-to-end encrypted instant messages, group messages, attachments, and more. It was developed by Open Whisper Systems in 2014 and has gained much popularity since then with over a million downloads on Google Play Store alone.
[appbox googleplay org.thoughtcrime.securesms]
There are two versions of the app: Signal Private Messenger (Free) which does not support SMS or MMS but provides strong encryption; and Signal (Free), which supports both voice calls and text messaging along with rich features like disappearing message functionality etc. But there’s another catch – to use all these premium features will cost $30/year after the one-year trial period expires! However, we can assure you that this price is worth it’s considering the security and other features you get with Signal.