Show messages on lock screen on Galaxy S3 Is it possible to show previews of messages (as the iPhone does) on the lock screen on a Galaxy S3 running android 4.1.2?
There is a settings on text Messaging App to Preview Messages on Lock Screen.

Go to Text Messaging App --> (press menu) Settings-->(go to Notification Settings) Check Preview Messages Option.

Or  

You can use this app. It will display new messages when phone is locked.