How to Encrypt Your Android Phone and Why You Might Want To

Android includes a system encryption feature that encrypts all data – including application data, downloaded files, and everything else – on your phone or tablet. You’ll have to enter your PIN or password each time you turn on your phone

We’ll be using the full-device encryption feature built into Android Gingerbread 2.3.4 and newer versions of Android for this.

by Chris Hoffman via How-To Geek