Calculator is the Vault app can secretly Hide Pictures, Hide Videos without anyone knowing as gallery lock installed in your phone looks like just a regular calculator. Your files will be secretly stored in a vault and can only be viewed after a Numeric PIN is entered on calculator panel of this app. Also, this Photo Locker can be used as regular calculator for daily use. How to use ✔ Hide Pictures and Videos : Click on Plus Button at the bottom of main screen and then select media from galle