To download Briar or Briar Mailbox directly from our site, you need to know what version of Android your device uses. You can usually find this information in the About phone section of the Settings app. Android 8 or later (most users) If your phone uses Android 8 or later, follow these steps to download Briar or Briar Mailbox: 1) Open the web browser and go to https://briarproject.org. Then go to https://briarproject.