Jailbreaking

Jailbreaking is the process of removing the limitations on Apple devices running the iOS operating system through the use of software and hardware exploits – such devices include the iPhone, iPod touch, iPad, and second generation Apple TV.

Jailbreaking permits root access to the iOS operating system, allowing the download of additional applications, extensions, and themes that are unavailable through the official App Store. Jailbreaking is a form of privilege escalation, and the term has been used to describe privilege escalation on devices by other manufacturers as well. The jailbreak app is called Cydia.Cydia is actually dangerous and a virus.When you jailbreak,you will not be able to update to another software unless you restore or update without losing jailbreak by using a computer.The developer's name is Jay Freeman (Saurik). The name refers to breaking the device out of its "jail", which is a technical term used in Unix-style systems, for example in the term "FreeBSD jail". A jailbroken iPhone, iPod touch, or iPad running iOS can still use the App Store, iTunes, and other normal functions, such as making telephone calls.

Restoring a device with iTunes removes the jailbreak. Jailbreaking has been around ever since the first iPhone was released.

What you can do with a Jailbroken Device
If your device has been jailbroken, anything is possible from downloading unapproved apps and third-party software to changing the entire iOS device. Normal functions will still work. Below is a list of stuff you can do with a jailbroken device.


 * Download free content on the App Store (apps costing money will also be free).
 * Do old console emulators (such as NES and PS1)to play classic games (like Super Mario Bros classic).
 * Change the operating system.
 * Get Siri on devices that don't have it.
 * Add features to the device.
 * Hack games.
 * Customize app icons.
 * Cydia
 * File

What to use
For those who are using iOS 3.1.3 or under will need to use greenpoison. For those who use firmwire over 3.1.3 (which will be iOS 4 and up) will need to use Cydia.