Ensure complete privacy of your data with the application SMS-Privacy.
The application intercepts SMS from your chosen destination and encrypts it placed in a separate folder in the application. Now nobody knows what you knows!
You can password protect your SMS, or even completely hide the application from the menu, then calling it by dialing a special code on the keyboard.
In this case you will always be aware of the fact that someone has sent you a message, and ignorant people will see any text that you ask again.