Earlier this week, an Alabama district attorney, Pamela Casey, posted a video warning parents about the "Calculator%" app for iPhone.

At first glance, the icon looks like a run-of-the-mill calculator, but when you open it and type in the correct passcode, it will open a treasure trove of hidden pictures and files that don't appear anywhere else on your device.


Calculator% is the app that Casey spoke about in her now-viral video, but it's important to note that the app has many imitators for both iPhone and Android platforms.
Here's what to look for on an iPhone:

And here are a couple of the Android iterations:
