I'm using the stock app that comes with the phone. Let me explain... You get a text message and your phone is locked. When you touch the screen, at least on my phone, you can see who has texted you last and also see a few of the words from the text. I use the lock screen that requires me to draw a pattern to unlock the screen. After unlocking the screen, I go to the messages and then read the message. The thing is this..my wife and I sometimes send texts saying things to each other that I don't want my kids to see. Either of them can pick up the phone, touch the screen and see a "quick preview" of a part of the message. Any help will be greatly appreciated.