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Another requirement is that the app has to support locking and PIN or biometric authentication to unlock the app for use.
Few apps are better than Signal which conducts secure communications while collecting a minimal amount of metadata.
video calling are a welcome addition and a rarity among similar apps.
Additionally, its ability to truly replace the default SMS messenger app on Android adds to its convenience as it is the only app on our list able to handle unencrypted SMS messages.
The Signal Protocol is one of the best in the world at protecting users' communication.
It is completely open-source, allowing all users access to its operation.