Authorities are warning parents about smartphone apps that children are using to hide photos and videos.

Law enforcement officials are warning parents about their children potentially concealing secrets with the help of seemingly innocent smartphone apps. 
The District Attorney from Blount County, Alabama posted a Facebook video warning her constituents of an app called "Private Photo" in the App Store. 
It appears on a user's home screen as "Calculator%" and even looks—and functions—like a regular calculator. 
Once users enter their passcode, however, the cunning calculator reveals a private