The world's leading all online messaging application Whats App does not know about. Whats App 64 billion around the world, but do you know that messages sent Whats App feature tells you that's a secret message from the person you are sending? Let us tell you.
Whats App application, go to Settings and turn to account section, this option will appear in the Storage Usage, click on it to open  before you will get a list of your friends, which will be listed in the How many messages sent to a friend Here at the bottom of the screen to go to the option of Size can also know who you chat with friends over the Internet while you're using the app Internet calls Low data usage data to save the new settings you can use.