Here's how you can download the Vault app free for Android devices.
1. Go to the Google Play page for the free app Vault.
2. Tap the Install button.
Here's a description of Vault:
"Get Vault, get your secret box. Hide secret photos,videos and SMS. Download this app to build a secret box to hide your secrets and fancy(crazy) party pics, videos.
Hide contacts, pics, videos, SMS, and even Facebook message for free NOW! Keep your private text messages, photos, and videos safely hidden from prying eyes.
Use NQ Mobile Vault to create your own password-protected space on your Android where you can encrypt and safely store private contacts, SMS messages, call logs, photos, and videos.
Download NOW and keep your data safe!"