This is a serious option for people seeking a wider range of privacy options. With this app you can hide photos and videos in an encrypted, password-protected vault on your phone. You can also hide contacts, text messages, and call history. If you add a contact then calls and text messages from that contact will no longer appear in your SMS folder or call logs.
If you upgrade to the premium version for $2.99 per month you’ll also get an online vault backup, a break-in monitor which will photograph anyone who enters the wrong password, and a stealth mode which completely hides the app unless you enter a password in the phone dialer. This is obviously a bit beyond what most people need, but if you take privacy seriously then it’s worth considering.