Here is some basic information and instructions to jailbreak:
What exactly is a jailbreak:
Literally translated means "jailbreak" jailbreak. The operating system (IOS) on the iPhone is a closed system. Generally, only applications (apps) to be installed from the AppStore by Apple. These apps are tested and approved by Apple. Probably you will ask yourself, why should I jailbreak my iPhone? Although the AppStore very willing vielfälltige selection of apps available, there is still not certain at iOS, and features of your home. Here comes the "Jailbreak" to the game, with help from "jailbreaking" is this closed system is opened and thus allows applications to be installed and used by third parties. In addition, after the jailbreak the optical change the app icons and the entire surface (themes) is possible.
After a jailbreak you can find a new app which is called Cydia on your homescreen. So you can access all the apps from third-party.
