Such discrete, very security, WOW!
Share your unique ID with your secret partner and start sending secret messages.
Only those people can write to you who you added. No unwanted messages, nobody can find you if you don't give them your ID. You can stay absolutely secured.
There isn't any sound or lightning notification when a new message received. Very discrete, nobody will notice it.
Very new feature! Disable the application to hide the app icon from the launcher screen. Use the invisible widget to open the application. Just remember where you put it!
More security with setting up a PIN code and using fingerprint authentication to open the application.