...
- Unless you have a full battery charge, plug in your device before beginning.
- Set a password of at least six characters that contains at least one number if you haven't already done this. Because this is also your screen unlock code, choose one that's easy to enter.
- Click Settings > Security > Encrypt Device. On some phones, you may need to choose Storage > Storage encryption or Storage > Lock screen and security > Other security settings to find the encrypt option. Depending upon your Android version and manufacturer, you may need to use the search option available on top of the settings menu.
- Follow the onscreen instructions to complete the process.
...