Ok there is no app for hiding messages.? I just came from Android and I had the evo. Android has an app called my calculator that hides everything inside the phone and it looks like a calculator. No apps like this one?
Yes there are several stock apps like that.
Also keep your media safe is another one.
All require you of course to move stuff into them but allow you to keep videos pics and texts safe. Hidden behind a calculator like you said.