How to bypass the lockscreen on an iDevice HD
This is a simple bug that works on jailbroken iDevices that lets you unlock the device without knowing the passcode. This works on themes like Android Lock, and should work with the default passcode. If you are using a custom lock, then you can swipe the bar and press safe mode, which will work when no apps are active. This gives full access to the device, unlike a bug that gives access to the Contacts.