Lock screen

The lock screen shall prevent unauthorized access to the device.

It is however vulnerable depending on iOS version:


 * 4.1 vulnerability detailed on www.engadget.com
 * 6.1 vulnerability detailed on www.theverge.com
 * 6.1.3 vulnerability detailed on arstechnica.com

In general the lock screen can be circumvented with any device where a jailbreak is available as shown on www.iphoneblogr.com.