Wondering how to hide texts on iPhone?

I have a lock, but when I get new texts they can be seen without having to put in the code! I know there's a way to fix this, but I don't know what it is. Also, there are conversations with certain people that I wouldn't necessarily want anyone to be able to read if they were to borrow my phone, so is there a way to keep them hidden without deleting them? Maybe an app or some setting that would allow me to put a lock on them? Not really sure what options there are, but any advice you can give me would be helpful.

Http://www.online-tech-tips.com/computer-tips/how-to-hide-text-messages-on-the-iphone-turn-off-sms-preview/
And there's no apps that you can hide your texts with.

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