As an iOS device user, you must have heard of jailbreak for a long time. And there are quite a number of people crazy about iPhone jailbreak. If you haven't yet jailbroken iPhone, iPad or iPod, you can read this article to learn how to jailbreak iPhone, iPad and iPad.
Jailbreak 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 Apple App Store. Jailbreaking is a form of privilege escalation. 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.
Before you start to jailbreak, sync and backup your iOS device. If you fail to jailbreak, it's quite likely that you might lose data on your iPhone, iPad or iPod. Alternatively, you can keep the iPhone Data Recovery for Mac, a data recovery tool for iOS devices, on your desktop. The Windows version of this tool is called iPhone Data Recovery.
It's easy to backup iOS devices with iTunes. Just connect iDevice to computer and open iTunes. Under Devices right-click the iPhone, iPad or iPod and select backup and Sync.
Besides jailbreak, you can find more info concerning iPhone here, for instance, How to Factory Reset iPhone.