Vault is an excellent app if you have secret things on your phone that you don't want others to see. It can hide your photos, videos, contacts, text messages, call logs, and even Facebook messages.
Hide Facebook messages
Vault stores your private files and records so they don't appear anywhere else on your phone. You choose a password for Vault and your private stuff can only be accessed by entering this correctly.
Some interesting features include the private Facebook chat feature where Vault encrypts messages sent over the social network and makes sure these don't appear in you Facebook chat history. Then the Device Administrator feature protects you against losing all your data through the app being uninstalled (accidentally or otherwise).
You can also lock apps so they can only be opened if the correct password is entered. Premium users can enable the Camouflage App Lock, which pretends that an app has crashed when someone else tries to open it.
By upgrading to premium, you can also hide individual contacts, which is very handy if there are people in your contacts you don't want prying eyes to find out about. The premium version has a number of other interesting features. This includes Break-in Alerts where if someone tries to access your Vault with an incorrect password you'll get an alert and the app will take a photo of who tried to access your private stuff!
Other neat features of the paid version include the ability to hide the Vault icon from your screen. Even more sneaky is a function to create a fake Vault. Using this, if someone finds out you've been hiding stuff and wants you to reveal all, you can use the fake Vault which doesn't show your secret photos, contacts, etc.
Then Vault Online for premium users allows you to back up your Vault data to a private cloud storage space (5 GB limit) and the data is encrypted to make sure nobody else can access it. Free users don't yet have this feature.
Choose what you want to hide
The user interface in Vault is clear and easy to use. You simply choose what you want to hide based on the categories listed. Vault lets you hide photos, videos, contacts, Facebook messages, phone numbers, and SMS messages.
The only issue is that Vault tells you to turn off your regular notifications to make sure you don't receive messages twice but currently the app doesn't alert you when you receive a message.
Overall, Vault is an excellently conceived application that lets you easily hide those 'sensitive' files, logs and information on your phone.