| Mobile Devices and Removable Media |
How to Encrypt and Secure Apple Devices (iPhone; i
How can I set a screensaver timeout on my Apple mobile devices (iPhones, iPads and iPods)?
You can set auto-lock which will turns off the display after a preset period of inactivity. Set this at Settings -> General -> Auto-Lock. You can specify the amount of time the screen must be locked before requiring a passcode (should be 15 minutes or less). Set this at Settings -> General -> Passcode Lock